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Car Physics Car Physics for Games by Level: Advanced Abstract: An introduction to car physics modelling for games.
One of the key points in simplifying vehicle physics is to handle the longtitudinal and lateral forces separately.
Longtitudinal forces operate in the direction of the car body or in the exact opposite direction.
Together these forces control the acceleration or deceleration of the car and therefore the speed of the car.
Lateral forces allow the car to turn.
These forces are caused by sideways friction on the wheels.
We'll also have a look at the angular moment of the car and the torque caused by lateral forces.
Notation and conventions Vectors are shown in bold, we'll be using 2d vectors.
I'll be mainly using S.
Straight line physics First let's consider a car driving in a straight line.
Which forces are at play here?
First of all there's what the tractive force, i.
The engine turns the wheels forward actually it applies a torque on the wheelthe wheels push backwards on the road surface and, in reaction, the road surface pushes back in a forward direction.
For now, we'll just say that the tractive force is equivalent in magnitude to the variable Engineforce, which is controlled directly by the user.
If this were the only force, the car would accelerate to infinite speeds.
Clearly, this is not the case in real life.
Enter the resistance forces.
The first and usually the most important one is air resistance, a.
This force is so important because it is proportional to the square of the velocity.
When we're driving fast and which game doesn't involve high speeds?
Note the difference of data type: speed is a scalar, velocity is a vector.
This is caused by friction between the rubber and road surface as the wheels roll along and friction in the axles, etc.
We'll approximate this with a force that's proportional to the velocity using another constant.
At low speeds the rolling resistance is the main resistance force, at high speeds the drag takes over in magnitude.
This means C rr must be approximately 30 times the value of C drag The total longtitudinal force is the vector sum of these three forces.
So in terms of magnitude, you're subtracting the resistance force from the traction force.
When the car is cruising at a constant speed the forces are in equilibrium and F long is zero.
This sounds more complicated than it is, usually the following equation does the trick.
This is known as the Euler method for numerical integration.
Together they also determine the top speed of the car for a given engine power.
There is no need to put a maximum speed anywhere in the code, it's just something that follows from the equations.
This is because the equations form a kind of negative feedback loop.
If the traction force exceeds all other forces, the car accelerates.
This means the velocity increases which causes the resistance forces to increase.
The net force decreases and therefore the acceleration decreases.
At some point the resistance forces and the engine force cancel each other out and the car has reached its top speed for that engine power.
In this diagram the X-axis denotes car velocity in meters per second and force values are set out along the Y-axis.
The traction force dark blue is set at an arbitrary value, it does not depend on the car velocity.
The rolling resistance purple line is a linear function of velocity and the drag yellow curve is a quadratic function of velocity.
At low speed the rolling resistance exceeds the drag.
At higher speeds the drag is the larger resistance force.
The sum of the two resistance forces is shown as a light blue curve.
Magic Constants So far, we've introduced two magic constants in our equations: C drag and C rr.
If you're not too concerned about realism you can give these any value that looks and feels good in your game.
For example, in an arcade racer you may want to have a car that accelerates faster than any car in real life.
On the other hand, if you're really serious about realistic simulation, you'll want to get these constants exactly right.
Approximate https://fonstor.ru/car-games/best-car-games-on-online.html for a Corvette: 0.
I couldn't confirm its value anywhere.
Be prepared to finetune this one to get realistic behaviour.
Braking When braking, the traction force is replaced by a braking force which is oriented in the opposite direction.
The total longtitudinal force is then the vector sum of these three forces.
Keep in mind to stop applying the braking force as soon as the speed is reduced to zero otherwise the car will end up going in reverse.
Weight Transfer An important effect when accelerating or braking is the effect of dynamic weight transfer.
When braking hard the car will nosedive.
During accelerating, the car leans back.
This is because just like the driver is pushed back in his just click for source when the pedal hits the metal, so is the car's centre of mass.
The effect of this is that the weight on the rear wheels increases during acceleration and the front wheels conversely have less weight to bear.
The effect of weight transfer is important for driving games for two reasons.
First of all the visual effect of the car pitching in response to driver actions adds a lot of realism to the game.
Suddenly, the simulation becomes a lot more lifelike in the user's experience.
Second of all, the weight distribution dramatically affects the maximum traction force per wheel.
For street tyres this may be 1.
Makes sense, doesn't it?
If you want to simplify this, you could assume that the static weight distribution is 50-50 over the front and rear axle.
An engine delivers an amount of torque.
Torque is like a rotational equivalent of force.
Torque is force times distance.
If you apply a 10 Newton force at 0.
That's the same torque as when you apply a 1 N force at 3 m from the axis.
In both cases the leverage is the same.
The torque that an engine can deliver depends on the speed at which the engine is turning, commonly expressed as rpm revolutions per minute.
The relationship torque versus rpm is not a linear relationship, but is usually provided as a curve known as a torque curve the exact shape and height of the curve is specific for each engine type, it is determined by engine tests.
Here's an example for the 5.
The curves are only defined in the range from, in this particular case, about 1000 to 6000 rpm, because that is the operating range of the engine.
Any lower, and the engine will stall.
Any higher above the so-called "redline"and you'll damage it.
Oh, and by the way, this is the maximum torque the engine can deliver at a given rpm.
The actual torque that the engine delivers depends on your throttle position and is a fraction between 0 and 1 of this maximum.
We're mostly interested in the torque curve, but some people find the power curve also interesting.
Check for yourself in the diagram above.
And here's the same curves in SI units: Newton meter for torque and kiloWatt for power.
The curves are the same shape, but the relative scale is different and because of that they don't cross either.
Now, the torque from the engine i.
The gearing multiplies the torque from the engine by a factor depending on the gear ratios.
Unfortunately, quite some energy is lost in the process.
As much as 30% of the energy could be lost in the form of heat.
This gives a so-called transmission efficiency of 70%.
Let me just point out that I've seen this mentioned as a typical value, I don't have actual values for any particular car.
The torque on the rear axle can be converted to a force of the wheel on the road surface by dividing by the wheel radius.
Force is torque divided by distance.
By the way, if you want to work out the radius of a tyre from those cryptic tyre identfication codes, have a look at the The Wheel and Tyre Bible.
It even provides a handy little calculator.
Here's an equation to get from engine torque to drive force: the longtitudinal force that the two rear wheels exert on the road surface.
Push the pedal down further than that and the wheels will start spinning and lose grip and the traction actually drops below the maximum amount.
So, for maximum acceleration the driver must exert an amount of force just below the friction threshold.
The subsequent acceleration causes a weight shift to the rear wheels.
The rear wheels now have extra weight which in this case is sufficient to allows the driver to put his foot all the way down.
Gear Ratios The following gear ratios apply to an Corvette C5 hardtop Source: First gear g1 2.
This will accelerate a mass of 1439 kg with 6.
The combination of gear and differential acts as a multiplier from the torque on the crankshaft to the torque on the rear wheels.
For example, the Corvette in first gear has a multiplier of 2.
This means each Newton meter of torque on the crankshaft results in 9.
Accounting for 30% loss of energy, this leaves 6.
Divide this by the wheel radius to get the force exerted by the wheels on the road and conversely by the road back to the wheels.
Let's take a 34 cm wheel radius, that gives us 6.
Of course, there's no such thing as a free lunch.
You clearly games police car driver charming just multiply torque and not have to pay something in return.
What you gain in torque, you have to pay back in angular velocity.
You trade off strength for speed.
For each rpm of the wheel, the engine has to do 9.
The rotational speed of the wheel is directly related to the speed of the car unless we're skidding.
Each revolution takes the wheel 2 pi R further, i.
So when the engine is doing 4400 rpm in first gear, that's 483 rpm of the wheels, is 8.
In low gears the gear ratio is high, so you get lots of torque but no so much speed.
In high gears, you get more speed but less torque.
You can put this in a graph as a set of curves, one for each gear, as in the following example.
Note that these curves assume a 100% efficient gearing.
The engine's torque curve is shown as well for reference, it's the bottom one in black.
The other curves show the torque on the rear axle for a given rpm of the axle!
As we've already seen, the rotation rate of the wheels can be related to car speed disregarding slip for the moment if we know the wheel radius.
Drive wheel acceleration Now beware, the torque that we can look up in the torque curves above for a given rpm, is the maximum torque at that rpm.
How much torque is actually applied to the drive wheels depends on the throttle position.
This position is determined by user input the accelerator pedal and varies from 0 to 100%.
Note that the gearbox increases the torque, but reduces the rate of rotation, especially in low gears.
How do we get the RPM?
So we need the rpm to calculate the engine's max torque and from there the engine's actual applied torque.
In other words, now we need to know has fast the engine's crankshaft is turning.
The way I do it is to calculate this back from the drive wheel rotation speed.
After all, if the engine's not declutched, the cranckshaft and the drive wheels are physically connected through a set of gears.
If we know the rpm, we can calculate the rotation speed of the drive wheels, and vice versa!
There are 60 seconds in a minute and 2 pi radians per revolution.
According to this equation, the cranckshaft rotates faster than the drive wheels.
First gear ratio is 2.
Because the torque curve isn't defined below a certain rpm, you may need to make sure the rpm is at least at some minimum value.
The wheels aren't turning so the rpm calculation would provide zero.
At zero rpm, the engine torque is either undefined or zero, depending how your torque curve lookup is implemented.
That would mean you'd never be able to get the car moving.
In real life, you'd be using the clutch in this case, gently declutching while the car starts moving.
So wheel rotation and engine rpm are more or less decoupled in this situation.
There are two ways to get the wheel rotation rate.
The first one is the easiest, but a bit of a quick hack.
The second one involves some more values to keep track of over time, but is more accurate and will allow for wheel spins, etcetera.
The easy way is to pretend the wheel is rolling and derive the rotation rate from the car speed and the wheel radius.
The more advanced way is to let the simulation keep track of the rear wheel rotation rate and how it changes in time due to the torques that act on the rear wheels.
In other words, we find the rotation rate by integrating the rotational acceleration over time.
The rotational acceleration at any particular instant depends on the sum of all the torques on the axle and equals the net torque divided by the rear axles inertia just like linear accelaration is force divided by mass.
The net torque is the drive torque we saw earlier minus the friction torques that counteract it braking torque if you're braking and traction torque from the contact with the road surface.
Slip ratio and traction force Calculating the wheel angular velocity from the car speed is only allowed if the wheel is rolling, in other words if there is no lateral slip between the tyre surface and the road.
This is true for the front wheels, but for drive wheels this is typically not true.
After all, if a wheel is just rolling along it is not transfering energy to keep the car in motion.
In a typical situation where the car is cruising at constant speed, the rear wheels will be rotating slighty faster than the front click the following article />The front wheels are rolling and therefore have zero slip.
You can calculate their angular velocity by just dividing the car speed by 2 pi times the wheel radius.
The rear wheels however are rotating faster and that means the surface of the tyre is slipping with regard to the road surface.
This slip causes a friction force in the please click for source opposing the slip.
The friction force will therefore be pointing to the front of the car.
In fact, this friction force, this reaction to the wheel slipping, is what pushes the car forwards.
This friction force is known as traction or as the longtitudinal force.
The traction depends on the amount of slip.
This particular definition also works for cars driving in reverse.
Slip ratio is zero for a free rolling wheel.
For a car braking with locked wheels the slip ratio is -1, and a car accelerating forward has a positive slip ratio.
The relationship between longtitudinal forward force and slip ratio can be described by a article source such as the following: Note how the force is zero if the wheel rolls, i.
The exact curve shape may vary per tyre, per road surface, per temperature, etc.
That means a wheel grips best with a little bit of slip.
Beyond that optimum, the grip decreases.
That's why a wheel spin, impressive as it may seem, doesn't actually give you the best possible acceleration.
There is so much slip that the longtitudinal force is below its peak value.
Decreasing the slip would give you more traction and better acceleration.
The longtitudinal force has as good as a linear dependency on load, we saw that earlier when we dicussed weight transfer.
So instead of plotting a curve for each particular load value, we can just create one normalized curve by dividing the force by the load.
To get from normalized longtitudinal force to actual longtitudinal force, multiply by the load on the wheel.
Cap the force to a maximum value so that the force doesn't increase after the slip ratio passes the peak value.
If you plot that in a curve, you get the following: Torque on the drive wheels To recap, the traction force is the friction force that the road surface applies on the wheel surface.
If the brake is applied this will cause a torque as well.
For the brake, I'll assume it delivers a constant torque in the direction opposite to the wheel' s rotation.
Take care of the direction, or you won't be able to brake when you're reversing.
The following diagram illustrates this for an accelerating car.
The engine torque is magnified by the gear ratio and the differential ratio and provides the drive torque on the rear wheels.
The angular velocity of the wheel is high enough that it causes slip between the tyre surface and the road, which can free car game driving online expressed as a positive slip ratio.
This results in a reactive friction force, known as the traction force, which is what pushed the car forward.
The traction force also results in a traction torque on the rear wheels which opposes the drive torque.
In this case the net torque is still positive and will result in an acceleration of the rear wheel rotation rate.
This will increase the rpm and increase the slip ratio.
If the driver is not braking, the brake torque is zero.
This torque will cause an angular acceleration of the drive wheels, just like a force applied on a mass will cause it to accelerate.
A positive angular acceleration will increase the angular velocity of the rear wheels over time.
This way we can determine how fast the drive wheels are turning and therefore we can calculate the engine's rpm.
The Chicken and the Egg Some people get confused at this point.
We games free for play car the rpm to calculate the torque, but the rpm depends on the rear wheel rotation rate which depends on the torque.
Surely, this is a circular definition, a chicken and egg situation?
This is an example of a Differential Equation: we have equations for different variables that mutually depend on each other.
But we've already seen another example of this before: air resistance depends on speed, yet the speed depends on air resistance because that influences the acceleration.
To solve differential equations in computer programs we use the technique of numeric integration: if we know all the values at time t, we can work out the values at time t + delta.
In other words, rather than trying to solve these mutually dependent equations by going into an infinite loop, we take snapshots in time and plug in values from the previous snapshot to work out the values of the new snapshot.
Just use the old values from the previous iteration to calculate the new values for the current iteration.
If the time step is small enough, it will give you the results you need.
There's a lot of theory on differential equations and numeric integration.
One of the problems is that a numeric integrator can "blow up" if the time step isn't small enough.
Instead of well-behaved values, they suddenly shoot to infinity because small errors are multiplied quickly into larger and larger errors.
Decreasing the time step can help, but costs more cpu cycles.
An alternative is to use a smarter integrator, e.
For more information on this topic, see my article on numerical stability: Curves Okay, enough of driving in a straight line.
How about some turning?
One thing to keep in mind is that simulating the physics of turning at low speed is different from turning at high speed.
At low speeds parking lot manoeuvresthe wheels pretty much roll in the direction they're pointed at.
To simulate this, you need some geometry and some kinetics.
You don't really need to consider forces and mass.
In other words, it is a kinetics problem not a dynamics problem.
At higher speeds, it becomes noticeable that the wheels can be heading in one direction while their movement is still in click to see more direction.
In other words, the wheels can sometimes have a velocity that is is not aligned with the wheel orientation.
This means there is a velocity component that is at a right angle to the wheel.
This of course causes a lot of friction.
After all a wheel is designed to roll in a particular direction and that without too much effort.
Pushing a wheel sideways is very difficult and causes a lot of friction force.
In high speed turns, wheels are being pushed sideways and we need to take these forces into account.
Let's first look at low speed cornering.
In this situation we can assume that the wheels are moving in the direction they're pointing.
The wheels are rolling, but not slipping sideways.
If the front wheels are turned at an angle delta and the car is moving at a constant speed, then the car will describe a circular path.
Imagine lines projecting from the centre of the hubcabs of the front and rear wheel at the inside of the curve.
Where these two lines cross, that's the centre of the circle.
This is nicely illustrated in the following screenshot.
Note how the green lines all intersect in one point, the centre round which the car is turning.
You may also notice that the front wheels aren't turned at the same angle, the outside wheel is turned slightly less than the inside wheel.
This is also what happens in real life, the steering mechanism of a car is designed to turn the wheels at a different angle.
For a car simulation, this subtlety is probably not so important.
I'll just concentrate on the steering angle of the front wheel at the inside of the curve and ignore the wheel at the other side.
This is a screen shot from a car physics demo by Rui Martins.
More illustrations and a download can be found at The radius of the circle can be determined via geometry as in the following diagram: The distance between front and rear axle is known at the wheel base and denoted as L.
The radius of the circle that the car describes to be precise the circle that the front wheel describes is called R.
The diagram shows a triangle with one vertex in the circle centre and one at the centre consider, realistic car game online remarkable each wheel.
The angle at the rear wheel is 90 degrees per definition.
The angle at the front wheel is 90 degrees minus delta.
This means the angle at the circle centre is also delta the sum of the angles of a triangle is always 180 degrees.
The sine of this angle is the wheel base divided by the circle radius, therefore: Note that if the steering angle is zero, then the circle radius is infinite, i.
Okay, so we can derive the circle radius from the steering angle, now what?
Well, the next step is to calculated the angular velocity, i.
Angular velocity is usually represented using the Greek letter omegaand is expressed in radians per second.
A radian is a full circle divided by 2 pi.
It is fairly simple to determine: if we're driving circles at a constant speed v and the radius of the circle is R, how long does it take to complete one circle?
That's the circumference divided by the speed.
In the time the car has described a circular path it has also rotated around its up-axis exactly once.
In other words: By using these last two equations, we know how fast the car must turn for a given steering angle at a check this out speed.
For low speed cornering, that's all we need.
The steering angle is determined from user input.
The car speed is determined as for the straight line cases the velocity vector always points in car physics games download car direction.
From this we calculate the circle radius and the angular velocity.
The angular velocity is used to change the car orientation at a specific rate.
The car's speed is unaffected by the turn, the velocity vector just rotates to match the car's orientation.
High Speed Turning Of course, there are not many games involving cars that drive around sedately apart from the legendary Trabant Granny Racer .
Gamers are an impatient lot and usually want to get somewhere in a hurry, preferably involving some squealing of tires, grinding of gearboxes and collateral damage to the surrounding environment.
Our goal is to find a physics model that will allow understeer,oversteer, skidding, handbrake turns, etc.
At high speeds, we can no longer assume that wheels are moving in the direction they're pointing.
They're attached to the car body which has a certain mass and takes time to react to steering forces.
The car body can also have an angular velocity.
Just like linear velocity, this takes time to build here or slow down.
This is determined by angular acceleration which is in turn dependent on torque and inertia which are the rotational games online for cars of force and mass.
Also, the car itself will not always be moving in the direction it's heading.
The car may be pointing one way but moving another way.
Think of rally drivers going through a curve.
The angle between the car's orientation and the car's velocity vector is known as the sideslip angle beta.
Now let's look at high speed cornering from the wheel's point of view.
In this situation we need to calculate the sideways speed of the tires.
Because wheels roll, they have relatively low resistance to motion in forward or rearward direction.
In the perpendicular direction, however, wheels have great resistance to motion.
Try pushing a car tire sideways.
This is very hard because you need to overcome the maximum static friction force to get the wheel to slip.
In high speed cornering, the tires develop lateral forces also known as the cornering force.
This force depends on the slip angle alphawhich is the angle between the tire's heading and its direction of travel.
As the slip angle grows, so does the cornering force.
The cornering force per tire also depends on the weight on that tire.
If you'd like to see this explained in a picture, consider the following one.
The velocity vector of the wheel has angle alpha relative to the direction in which the wheel can roll.
We can split the velocity vector v up into two component vectors.
Movement in this direction corresponds to the rolling motion of the wheel.
There are three contributors to the slip angle of the wheels: the sideslip angle of the car, the angular rotation of the car around the up axis yaw rate and, for the front wheels, the steering angle.
The sideslip angle b bèta is the difference between the car orientation and the direction of movement.
In other words, it's the angle between the longtitudinal axis and the actual direction of travel.
So it's similar in concept to what the slip angle is for the tyres.
Because the car may be moving in a different direction than where it's pointing at, it experiences a sideways motion.
This is equivalent to the perpendicular component of the velocity vector.
If the car turns full circle, the front wheel describes a circular path of distance 2.
Note the sign reversal.
To express this as an angle, take the arctangent of the lateral velocity divided by the longtitudinal velocity just like we did for beta.
The steering angle delta is the angle that the front wheels make relative to the orientation of the car.
There is no steering angle for the rear wheels, these are always in line with the car body orientation.
If the car is reversing, the effect of the steering is also reversed.
The slip angles for the front and rear wheels are given by the following equations: The lateral force exercised by the tyre is a function of the slip angle.
In please click for source, for real tyres it's quite a complex function once again best described by curve diagrams, such as the following: What this diagram shows is how much lateral sideways force is created for any particular value of the slip angle.
This type of diagram is specific to a particular type of tyre, this is a fictitious but realistic example.
The peak is at about 3 degrees.
At that point the lateral force even slightly exceeds the 5KN load on the tyre.
This diagram is similar to the slip ratio curve we saw earlier, but don't confuse them.
The slip ratio curve gives us the forward force depending on amount of longtitudinal slip.
This curve gives us the sideways lateral force depending on slip angle.
The lateral force not only depends on the slip angle, but also on the load on the tyre.
This car physics games download a plot for a load of 5000 N, i.
Different curves apply to different loads because the weight changes the tyre shape and therefore its read article />But the shape of the curve is very similar apart from the scaling, so we can approximate that the lateral force is linear with load and create a normalized lateral force diagram by dividing the lateral force by the 5KN of load.
This is the slope of the diagram at slip angle 0.
If you want a better approximation of the the relationship between slip angle and lateral force, search for information on the so-called Pacejka Magic Formula, names after professor Pacejka who developed this at Delft University.
That's what tyre physicists use to model tyre behaviour.
It's a set of equations with lots of "magic" constants.
By choosing the right constants these equations provide a very good approximation of curves found through tyre tests.
The problem is that tyre manufactors are very secretive about the values of these constants for actual tyres.
So on the one hand, it's a very accurate modeling technique.
On the other hand, you'll have a hard time finding good tyre data to make any use whatsoever of that accuracy.
The lateral forces of the four tyres have two results: a net cornering force and a torque around the yaw axis.
The cornering force is the force on the CG at a right angle to the car orientation and serves as the centripetal force which is required to describe a circular path.
The contribution of the rear wheels to the cornering force is the same as the lateral force.
For the front wheels, multiply the lateral force with cos delta to allow for the steering angle.
After all, it would look very silly if the car is describing a circle but keeps pointing in the same direction.
The cornering force makes sure the CG describes a circle, but since it operates on a point mass it car physics games download nothing about the car orientation.
That's what we need the torque around the yaw axis for.
Torque is force multiplied by the perpendicular distance between the point where the force is applied and the pivot point.
Note that the sign differs.
Applying torque on the car body introduces angular acceleration.
The inertia for a rigid body is a constant which depends on this web page mass and geometry and the distribution of the mass within its geometry.
Engineering handbooks provide formulas for the inertia of common shapes such as spheres, cubes, etc.
Epilogue You can a demo car demo v0.
Or easier yet, try the by Marcel "Bloemschneif" Sodeike!
If you spot mistakes in this tutorial or find sections that could do with some clarification, let me know.
Car specifications It's handy to know what sort of values to use for all these different constants we've seen.
Preferably some real values from some real cars.
I've collected what I could for a.
Be warned: some of the data is still guesswork.
Units and Conversions The following S.
A pound is a unit of force and a kilogram is a unit of mass.
What we mean by this "conversion" is that one pound of weight which is a force equals the weight exerted by 0.
On the moon, a kilogram car physics games download weigh less but still have the same mass.
Unit converter on the web: Marco Monster E-mail: Website: Copyright 2000-2003 Marco Monster.
This tutorial may not be copied or redistributed without permission.

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Car Physics Car Physics for Games by Level: Advanced Abstract: An introduction to car physics final, car driving games free download matchless for games.
One of the key points in simplifying vehicle physics is to handle the longtitudinal and lateral forces separately.
Longtitudinal forces operate in the direction of the car body or in the exact opposite direction.
Together these forces control the acceleration or deceleration of the car and therefore the speed of the car.
Lateral forces allow the car to turn.
These forces are caused by sideways friction on the wheels.
We'll also have a look at the angular moment of the car and the torque caused by lateral forces.
Notation and conventions Vectors are shown in bold, we'll be using 2d vectors.
I'll be mainly using S.
Straight line physics First let's consider a car driving in a straight line.
Which forces are at play here?
First of all there's what the tractive force, i.
The engine turns the wheels forward actually it applies a torque on the wheelthe wheels push backwards on the road surface and, in reaction, the road surface pushes back in a forward direction.
For now, we'll just say that the tractive force is equivalent in magnitude to the variable Engineforce, which is controlled directly by the user.
If this were the only force, the car would accelerate to infinite speeds.
Clearly, this is not the case in real life.
Enter the resistance forces.
The first and usually the most important one is air resistance, a.
This force is so important because it is proportional to the square of the velocity.
When we're driving fast and which game doesn't involve high speeds?
Note the difference of data type: speed is a scalar, velocity is a vector.
This is caused by friction between the rubber and road surface as the wheels roll along and friction in the axles, etc.
We'll approximate this with a force that's proportional to the velocity using another constant.
At low speeds the rolling resistance is the main resistance force, at high speeds the drag takes over in magnitude.
This means C rr must be approximately 30 times the value of C drag The total longtitudinal force is the vector sum of these three forces.
So in terms of magnitude, you're subtracting the resistance force from the traction force.
When the car is cruising at a constant speed the forces are in equilibrium and F long is zero.
This sounds more complicated than it is, usually the following equation does the trick.
This is known as the Euler method for numerical integration.
Together they also determine the top speed of the car for a given engine power.
There is no need to put a maximum speed anywhere in the code, it's just something that follows from the equations.
This is because the equations form a kind of negative feedback loop.
If the traction force exceeds all other forces, the car accelerates.
This means the velocity increases which causes the resistance forces to increase.
The net force decreases and therefore the https://fonstor.ru/car-games/extreme-car-driving-games-free-download.html decreases.
At some point the resistance forces and the engine force cancel each other out and the car has reached its top speed for that engine power.
In this diagram the X-axis denotes car velocity in meters per second and force values are set out along the Y-axis.
The traction force dark blue is set at an arbitrary value, it does not depend on the car velocity.
The rolling resistance purple line is a linear function of velocity and the drag yellow curve is car physics games download quadratic function of velocity.
At low speed the rolling resistance exceeds the drag.
At higher speeds the drag is the larger resistance force.
The sum of the two resistance forces is shown as a light blue curve.
Magic Constants So far, we've introduced two magic constants in our equations: C drag and C rr.
If you're not too concerned about realism you can give these any value that looks and feels good in your game.
For example, in an arcade racer you may want to have a car that accelerates faster than any car in real life.
On the other hand, if you're really serious about realistic simulation, you'll want to get these constants exactly right.
Approximate value for a Corvette: 0.
I couldn't confirm its value anywhere.
Be prepared to finetune this one to get realistic behaviour.
Braking When braking, the traction force is replaced by a braking force which is oriented in the opposite direction.
The total longtitudinal force is then the vector sum of these three forces.
Keep in mind to stop applying the braking force as soon as the speed is reduced to zero otherwise the car car physics games download end up going in reverse.
Weight Transfer An important effect when accelerating or braking is the effect of dynamic weight transfer.
When braking hard the car will nosedive.
During accelerating, the car leans back.
This is because just like the driver is pushed back in his seat when the pedal hits the metal, so is the car's centre of mass.
The effect of this is that the weight on the rear wheels increases during acceleration and the front wheels conversely have less weight to bear.
The effect of weight transfer is important for driving games for two reasons.
First of all the visual effect of the car pitching in response to driver actions adds a lot of realism to the game.
Suddenly, the simulation becomes a lot more lifelike in the user's experience.
Second of all, the weight distribution dramatically affects the maximum traction force per wheel.
For street tyres this may be 1.
Makes sense, doesn't it?
If you want to simplify this, you could assume that the static weight distribution is 50-50 over the front and rear axle.
An engine delivers an amount of torque.
Torque is like a rotational equivalent of force.
Torque is force times distance.
If you apply a 10 Newton force at 0.
That's the same torque as when you apply a 1 N force at 3 m from the axis.
In both cases the leverage is the same.
The torque that an engine can deliver depends on the speed at which the engine is turning, commonly expressed as rpm revolutions per minute.
The relationship torque versus rpm is not a linear relationship, but is usually provided as a curve known as a torque curve the exact shape and height of the curve is specific for each engine type, it is determined by engine tests.
Here's an example for the 5.
The curves are only defined in the range from, in this particular case, about 1000 to 6000 rpm, because that is the operating range of the engine.
Any lower, and the engine will stall.
Any higher above games police online driving free car so-called "redline"and you'll damage it.
Oh, and by the way, this is the maximum torque the engine can deliver at a given rpm.
The actual torque that the engine delivers depends on your throttle position and is a fraction between 0 and 1 of this maximum.
We're mostly interested in the torque curve, but some people find the power curve also interesting.
Check for yourself in the diagram above.
And here's the same curves in SI units: Newton meter for torque and kiloWatt for power.
The continue reading are the same shape, but the relative scale is different and because of that they don't cross either.
Now, the torque from the engine i.
The gearing multiplies the torque from the engine by a factor depending on the gear ratios.
Unfortunately, quite some energy is lost in the process.
As much as 30% of the energy could be lost in the form of heat.
This gives a so-called transmission efficiency of 70%.
Let me just point out that I've seen this mentioned as a typical value, I don't have actual values for any particular car.
The torque on the rear axle can be converted to a force of the wheel on the road surface by dividing by the wheel radius.
Force is torque divided by distance.
By the way, if you want to work out car physics games download radius of a tyre from those cryptic tyre identfication codes, have a look at the The Wheel and Tyre Bible.
It even provides a handy little calculator.
Here's an equation to get from engine torque to drive force: the longtitudinal force that the two rear wheels exert on the road surface.
Push the pedal down further than that and the wheels will start spinning and lose grip and the traction actually drops below the maximum amount.
So, for maximum acceleration the driver must exert an amount of force just below the friction threshold.
The subsequent acceleration causes a weight shift to the rear wheels.
The rear wheels now have extra weight which in this case is sufficient to allows the driver to put his foot all the way down.
Gear Ratios The following gear ratios apply to an Corvette C5 hardtop Source: First gear g1 2.
This will accelerate a mass of 1439 kg with 6.
The combination of gear and differential acts as a multiplier from the torque on the crankshaft car physics games download the torque on the rear wheels.
For example, the Corvette in first gear has a multiplier of 2.
This means each Newton meter of torque on the crankshaft results in 9.
Accounting for 30% loss of energy, this leaves 6.
Divide this by the wheel radius to get the force exerted by the wheels on the road and conversely by the road back to the wheels.
Let's take a 34 cm wheel radius, that gives us 6.
Of course, there's no such thing as a free lunch.
You can't just multiply torque and not have to pay something in return.
What you gain in torque, you have to pay back in angular velocity.
You trade off strength for speed.
For each rpm of the wheel, the engine has to do 9.
The rotational speed of the wheel is directly related to the speed of the car unless we're skidding.
Each revolution takes the wheel 2 pi R further, i.
So when the engine is doing 4400 rpm in first gear, that's 483 rpm of the wheels, is 8.
In low gears the gear ratio is high, so you get lots of torque but no so much speed.
In high gears, you get more speed but less torque.
You can put this in a graph as a set of curves, one for each gear, as in the following example.
Note that these curves assume a 100% efficient gearing.
The engine's torque curve is shown as well for reference, it's the bottom one in black.
The other curves show the torque on the rear axle for a given rpm of the axle!
As we've already seen, the rotation rate of the wheels can be related to car speed disregarding slip for the moment if we know the wheel radius.
Drive wheel acceleration Now beware, the torque that we can look up in the torque curves above for a given rpm, is the maximum torque at that rpm.
visit web page much torque is actually applied to the drive wheels depends on the throttle position.
This position is determined by user input the accelerator car physics games download and varies from 0 to 100%.
Note that the gearbox increases the torque, but reduces the rate of rotation, especially in low gears.
How do we get the RPM?
So we need the rpm to calculate the engine's max torque and from there the engine's actual applied torque.
In other words, now we need to know has fast the engine's crankshaft is turning.
The way I do it is to calculate this back from the drive wheel rotation speed.
After all, if the engine's not declutched, the cranckshaft and the drive wheels are physically connected through a set of gears.
If we know the rpm, we can calculate the rotation speed of the drive wheels, and vice versa!
There are 60 seconds in a minute and 2 pi radians per revolution.
According to this equation, the cranckshaft rotates faster than the drive wheels.
First gear ratio is 2.
Because the torque curve isn't defined below a certain rpm, you may need to make sure the rpm is at least at some minimum value.
The wheels aren't turning so the rpm calculation would provide zero.
At zero rpm, the engine torque is either undefined or zero, depending how your torque curve lookup is implemented.
That would mean you'd never be able to get the car moving.
In real life, you'd be using the clutch in this case, gently declutching while the car starts moving.
So wheel rotation and engine rpm are more or less decoupled in this situation.
There are two ways to get the wheel rotation rate.
The first one is the easiest, but a bit of a quick hack.
The second one involves some more values to keep track of over time, but is more accurate and will allow for wheel spins, etcetera.
The easy way is to pretend the wheel is rolling and derive the rotation rate from the car speed and the wheel radius.
The more advanced way is to let the simulation keep track of the rear wheel rotation rate and how it changes in time due to the torques that act on the rear wheels.
In other words, we find the rotation rate by integrating the rotational acceleration over time.
The rotational acceleration at any particular instant depends on the sum of all the torques on the axle and equals the net torque divided by the rear axles inertia just like linear accelaration is force divided by mass.
The net torque is the drive torque we saw earlier minus the friction torques that counteract it braking torque if you're braking and traction torque from the contact with the road surface.
Slip ratio and traction force Calculating the wheel angular velocity from the car speed is only allowed if the wheel is rolling, in other words if there is no lateral slip between the tyre surface and the road.
This is true for the front wheels, but for drive wheels this is typically not true.
After all, if a wheel is just rolling along it is not transfering energy to keep the car in motion.
In a typical situation where the car is cruising at constant speed, games free for play car rear wheels will be rotating slighty faster than the front wheels.
The front wheels are rolling and therefore have zero slip.
You can calculate their angular velocity by just dividing the car speed by 2 pi times the wheel radius.
The rear wheels however are rotating faster and that means the surface of the tyre is slipping with regard to the road surface.
This slip causes a friction car physics games download in the direction opposing the slip.
The friction force will therefore be pointing to the front of the car.
In fact, this friction force, this reaction to the wheel slipping, is what pushes the car forwards.
This friction force is known as traction or as the longtitudinal force.
The traction depends on the amount of slip.
This particular definition also works for cars driving in reverse.
Slip ratio is zero for a free rolling wheel.
For a car braking with locked wheels the slip ratio is -1, and a car accelerating forward has a positive slip ratio.
It can even be larger than 1 of there's a lot of slip.
The relationship between longtitudinal forward force and slip ratio can be described by a curve such as the following: Note how the force is zero if the wheel rolls, i.
The exact curve shape may vary per tyre, per road surface, per temperature, etc.
That means a wheel grips best with a little bit of slip.
Beyond that optimum, the grip decreases.
That's why a wheel spin, impressive as it may seem, doesn't actually give you the best possible acceleration.
There is so much slip that the longtitudinal force is below its peak value.
Decreasing the slip would give you more traction and better acceleration.
The longtitudinal force has as good as a linear dependency on load, we saw that earlier when we dicussed weight transfer.
So instead of plotting a curve for each particular load value, we can just create one normalized curve by dividing the force by the load.
To get from normalized longtitudinal force to actual longtitudinal force, multiply by the load on the wheel.
Cap the force to a maximum value so that the force doesn't increase after the slip ratio passes the peak value.
If you plot that in a curve, you get the following: Torque on the https://fonstor.ru/car-games/cars-online-games-download.html wheels To recap, the traction force is the friction force that the road surface applies on the wheel surface.
If the brake is applied this will cause a torque as well.
For the brake, I'll assume it delivers a constant torque in the direction opposite to the wheel' s rotation.
Take care of the direction, or you won't be able to brake when you're reversing.
The following diagram illustrates this for an accelerating car.
The engine torque is magnified by the gear ratio and the differential ratio and provides the drive torque on the rear wheels.
The angular velocity of the wheel is high enough that it causes slip between the tyre surface and the road, which can be expressed as a positive slip ratio.
This results in a reactive friction force, known as the traction force, which is what pushed the car forward.
The traction force also results in a traction torque on the rear wheels which opposes the drive torque.
In this case the net torque is still positive and will result in an acceleration of the rear wheel rotation rate.
This will increase the rpm and increase the slip ratio.
If the driver is not braking, the brake torque is zero.
This torque will cause an angular acceleration of the drive wheels, just like a force applied on a mass will cause it to accelerate.
A positive angular acceleration will increase the angular velocity of the rear wheels over time.
This way we can determine how fast the drive wheels are turning and therefore we can calculate the engine's rpm.
The Chicken and the Egg Some people get confused at this point.
We need the rpm to calculate the torque, but the rpm depends on the rear wheel rotation rate which depends on the torque.
Surely, this is a circular definition, a chicken and egg situation?
This is an example of a Differential Equation: we have equations for different variables that mutually depend on each other.
But we've already seen another example of this before: air resistance depends on speed, yet the speed depends on air resistance because that influences the acceleration.
To solve differential equations in computer programs we use the technique of numeric integration: if we know all the values at time t, we can work out the see more at time t + delta.
In other words, rather than trying to solve these mutually dependent equations by going into an infinite loop, we take snapshots in time and plug in values from the previous snapshot to work out the values of the new snapshot.
Just use the old values from the previous iteration to calculate the new values for the current iteration.
If the time step is small enough, it will give you the results you need.
There's a lot of theory on differential equations and numeric integration.
One of the problems is that a numeric integrator can "blow up" if the time step isn't small enough.
Instead of well-behaved values, they suddenly shoot to infinity because small errors are multiplied quickly into larger and larger errors.
Decreasing the time step can help, but costs more cpu cycles.
An alternative is to use a smarter integrator, e.
For more information on this topic, see my article on numerical stability: Curves Okay, enough of driving in a straight line.
How about some turning?
One thing to keep in mind is that simulating the physics of turning at low speed is different from turning at high speed.
At low speeds parking lot manoeuvresthe wheels pretty much roll in the direction they're pointed at.
To simulate this, you need some geometry and some kinetics.
You don't really need to consider forces and mass.
In other words, it is a kinetics problem not a dynamics problem.
At higher speeds, it becomes noticeable that the wheels can be heading in one direction while their movement is still in another direction.
In other words, the wheels can sometimes have a velocity that is is not aligned with the wheel orientation.
This means there is a velocity component that is at a right angle to the wheel.
This of course causes a lot of friction.
After all a wheel is designed to roll in a particular direction and that without too much effort.
Pushing a wheel sideways is very difficult and causes a lot of friction force.
In high speed turns, wheels are being pushed sideways and we need to take these forces into account.
Let's first look at low speed cornering.
In this situation we can assume that the wheels are moving in the direction they're pointing.
The wheels are rolling, but not slipping sideways.
If the front wheels are turned at an angle delta and the car is moving at a constant speed, then the car will describe a circular path.
Imagine lines projecting from the centre of the hubcabs of the front and rear wheel at the inside of the curve.
Where these two lines cross, that's the centre of the circle.
This is nicely illustrated in the following screenshot.
Note how the green lines all intersect in one point, the centre round which the car is turning.
You may also notice that the front wheels aren't turned at the same angle, the outside wheel is turned slightly less than the inside wheel.
This is also what happens in real life, the steering mechanism of a car is designed to turn the wheels at a different angle.
For a car simulation, this subtlety is probably not so important.
I'll just concentrate on the steering angle of the front wheel at the inside of the curve and ignore the wheel at the other side.
This is a screen shot from a car physics demo by Rui Martins.
More illustrations and a download can be found at The radius of the circle can be determined via geometry as in the following diagram: The distance between front and rear axle is known at the wheel base and denoted as L.
The radius of the circle that the car describes to be precise the circle that the front wheel describes is called R.
The diagram shows a triangle with one vertex in the circle centre and one at the centre of each wheel.
The angle at the rear wheel is 90 degrees per definition.
The angle at the front wheel is 90 degrees minus delta.
This means the angle at the circle centre is also delta the sum of the angles of a triangle is always 180 degrees.
The sine of this angle is the wheel base divided by the circle radius, therefore: Note that if the steering angle is zero, then the circle radius is infinite, i.
Okay, so we can derive the circle radius from the steering angle, now what?
Well, the next step is to calculated the angular velocity, i.
Angular velocity is usually represented using the Greek letter omegaand is expressed in radians per second.
A radian is a full circle divided by 2 pi.
It is fairly simple to determine: if we're driving circles at a constant speed v and the radius of the circle is R, how long does it take to complete one circle?
That's the circumference divided by the speed.
In the time the car has described a circular path it has also rotated around its up-axis exactly once.
In other words: By using these last two equations, we know how fast the car must turn for a given steering angle at a specific speed.
For low speed cornering, that's all we need.
The steering angle is determined from user input.
The car speed is determined as for the straight line cases the velocity vector always points in the car direction.
From this we calculate the circle radius and the angular velocity.
The angular velocity is used to change the car orientation at a specific rate.
The car's speed is unaffected by the turn, the velocity vector just rotates to match the car's orientation.
High Speed Turning Of course, there are not many games involving cars that drive around sedately apart from the legendary Trabant Granny Racer .
Gamers are an impatient lot and usually want to get somewhere in a hurry, preferably involving some squealing of tires, grinding of gearboxes and collateral damage to the surrounding environment.
Our goal is to find a physics model that will allow understeer,oversteer, skidding, handbrake turns, etc.
At high speeds, we can no longer assume that wheels are moving in the direction they're car physics games download />They're attached to the car body which has a certain mass and takes time to react to steering forces.
The car body can also have an angular velocity.
Just like linear velocity, this takes time to build up or slow down.
This is determined by angular acceleration which is in turn dependent on torque and inertia which are the rotational equivalents of force and mass.
Also, the car itself will not always be moving in the direction it's heading.
The car may be pointing one way but moving another way.
Think of rally drivers going through a curve.
The angle between the car's orientation and the car's velocity vector is known as the sideslip angle beta.
Now let's look at high speed cornering from the wheel's point of view.
In this situation we need to calculate the sideways speed of the tires.
Because wheels roll, they have relatively low resistance to motion in forward or rearward direction.
In the perpendicular direction, however, wheels have great resistance to motion.
Try pushing a car tire sideways.
This is very hard because you need to overcome the maximum static friction force to get the wheel to slip.
In high speed cornering, the tires develop lateral forces also known as the cornering force.
This force depends on the slip angle alphawhich is the angle between the tire's heading and its direction of travel.
As the slip angle grows, so does the cornering force.
The cornering force per tire also depends on the weight on that tire.
If you'd like to see this explained in a picture, consider the following one.
The velocity vector of the wheel has angle alpha relative to the direction in which the wheel can roll.
We can split the velocity vector v up into two component vectors.
Movement in this direction corresponds to the rolling motion of the wheel.
There are three contributors to the slip angle of the wheels: the sideslip angle of the car, the angular rotation of the car around the up axis yaw rate and, for the front wheels, the steering angle.
The sideslip angle b bèta is the difference between the car orientation and the direction of movement.
In other words, it's the angle between the longtitudinal axis and the actual direction of travel.
So it's similar in concept to what the slip angle is for the tyres.
Because the car may be moving in a different direction than where it's pointing at, link experiences a sideways motion.
This is equivalent to the perpendicular component of the velocity vector.
If the car turns full circle, car physics games download front link describes a circular path of distance 2.
Note the sign reversal.
To express this as an angle, take the arctangent of the lateral velocity divided by the longtitudinal velocity just like we did for beta.
The steering angle delta is the angle that the front wheels make relative to the orientation of the car.
There is no steering angle for the rear wheels, these are always in line with the car body orientation.
If the car is reversing, the effect of the steering is also reversed.
The slip angles for the front and rear wheels are given by the following equations: The lateral force exercised by the tyre is a function of the slip angle.
In fact, for real tyres it's quite a complex function once again best described by curve diagrams, such as the following: What this diagram shows is how much lateral sideways force is created for any particular value of the slip angle.
This type of diagram is specific to a particular type of tyre, this is a fictitious but realistic example.
The peak is at about 3 degrees.
At that point the lateral force even slightly exceeds the 5KN load on the tyre.
This diagram is similar to the slip ratio curve we saw earlier, but don't confuse them.
The slip ratio curve gives us the forward force depending on amount of longtitudinal slip.
This curve gives us the sideways lateral force depending on slip angle.
The lateral force not only depends on the slip angle, but also on the load on the tyre.
This is a plot for a load of 5000 N, i.
Different curves apply to different loads because the weight changes the tyre shape and therefore its properties.
But the shape of the curve is very similar apart from the scaling, so we can approximate that the lateral force is linear with load and create a normalized lateral force diagram by dividing the lateral force by the 5KN of load.
This is the slope of the diagram at slip angle 0.
If you want a better approximation of the the relationship between slip angle and lateral force, search for information on the so-called Pacejka Magic Formula, names after professor Pacejka who developed this at Delft University.
That's what tyre physicists use to model tyre behaviour.
It's a set of equations with lots of "magic" constants.
By choosing the right constants these equations provide a very good approximation of curves found through tyre tests.
The problem is that tyre manufactors are very secretive about the values of these constants for actual tyres.
So on the one hand, it's a very accurate modeling technique.
On the other hand, you'll have a hard time finding good see more data to make any use whatsoever of that accuracy.
The lateral forces of the four tyres have two results: a net cornering force and a torque around the yaw axis.
The cornering force is the force on the CG at a right angle to the car orientation and serves as the centripetal force which is required to describe a circular path.
The contribution of the rear wheels to the cornering force is the same as the lateral force.
For the front wheels, multiply the lateral force with cos delta to allow for the steering angle.
After all, it would look very silly if the car is describing a circle but keeps pointing in the same direction.
The cornering force makes sure the CG describes a circle, but since it operates on a point mass it does nothing about the car orientation.
That's what we need the torque around the yaw axis for.
Torque is force multiplied by the perpendicular distance between the point where the force is applied and the pivot point.
Note that the sign differs.
Applying torque on the car body introduces angular acceleration.
The inertia for a rigid body is a constant which depends on its mass and geometry and the distribution of the mass within its geometry.
Engineering handbooks provide formulas for the inertia of common shapes such as spheres, cubes, etc.
Epilogue You can a demo car demo v0.
Or easier yet, try the by Marcel "Bloemschneif" Sodeike!
If you spot mistakes in this tutorial or find sections that could do with some clarification, let me know.
Car specifications It's handy to know what sort of values to use for all these different constants we've seen.
Preferably some real values from some real cars.
I've collected what I could for a.
Be warned: some of the data is still guesswork.
Units and Conversions The following S.
A pound is a unit of force and a kilogram is a unit of mass.
What we mean by this "conversion" is that one pound of weight which is a force equals the weight exerted by 0.
On the moon, a kilogram will weigh less but still have the same mass.
Unit converter on the web: Marco Monster E-mail: Website: Copyright 2000-2003 Marco Monster.
This tutorial may not be copied or redistributed without permission.

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Car Physics Car Physics for Games by Level: Advanced Abstract: An introduction to car physics modelling for games.
One of the key points in simplifying vehicle physics is to handle the longtitudinal and lateral forces separately.
Longtitudinal forces operate in the direction of the car body or in the exact opposite direction.
Together these forces control the acceleration or deceleration of the car and therefore the speed of the car.
Lateral forces allow the car to turn.
These forces are caused by sideways friction on the wheels.
We'll also have a look at the angular moment of the car and the torque caused by lateral forces.
Notation and conventions Vectors are shown in bold, we'll be using 2d vectors.
I'll be mainly using S.
Straight line physics First let's consider a car driving in a straight line.
Which forces are at play here?
First of all there's what the tractive force, i.
The engine turns the wheels forward actually it applies a torque on the wheelthe wheels push backwards on the road surface and, in reaction, the road surface pushes back in a forward direction.
For now, we'll just say that the tractive force is equivalent in magnitude to the variable Engineforce, which is controlled directly by the user.
If this were the only force, the car would accelerate to infinite speeds.
Clearly, this is not the case in real life.
Enter the resistance forces.
The first and usually the most important one is air resistance, a.
This force is so important because it is proportional to the square of the velocity.
When we're driving fast and which game doesn't involve high speeds?
Note the difference of data type: speed is a scalar, velocity is a vector.
This is caused by friction between the rubber and road surface as the wheels roll along and friction in the axles, etc.
We'll approximate this with a force that's proportional to the velocity using another constant.
At low speeds the rolling resistance is the main resistance force, at download free car extreme games driving speeds the drag takes over in magnitude.
This means C rr must be approximately 30 times the value of C drag The total longtitudinal force is the vector sum of these three forces.
So in terms of magnitude, you're subtracting the resistance force from the traction force.
When the car is cruising at a constant speed the forces are in equilibrium and F long is zero.
This sounds more complicated than it is, usually the following equation does the trick.
This is known as the Euler method for numerical integration.
Together they also determine the top speed of the car for a given engine power.
There is no need to put a maximum speed anywhere in the code, it's just something that follows from the equations.
This is because the equations form a kind of negative feedback loop.
If the traction force exceeds all other forces, the car accelerates.
This means the velocity increases which causes the resistance forces to increase.
The net force decreases and therefore the acceleration decreases.
At some point the resistance forces and the engine force cancel each other out and the car has reached its top speed for that engine power.
In this diagram the X-axis denotes car velocity in meters per second and force values are set out along the Y-axis.
The traction force dark blue is set at an arbitrary value, it does not depend on the car velocity.
The rolling resistance purple line is a linear function of velocity and the drag yellow curve is a quadratic function of velocity.
At low speed the rolling resistance exceeds the drag.
At higher speeds the drag is the larger resistance force.
The sum of the two resistance forces is shown as a light blue curve.
Magic Constants So far, we've introduced two magic constants in our equations: C drag and C rr.
If you're not too concerned about realism you can give these any value that looks and feels good in your game.
For example, in an arcade racer you may want to have a car that accelerates faster than any car in real life.
On the other hand, if you're really serious about realistic simulation, you'll want to get these constants exactly right.
Approximate value for a Corvette: 0.
I couldn't confirm its value anywhere.
Be prepared to finetune this one to get realistic behaviour.
Braking When braking, the traction force is replaced by a braking force which is oriented in the opposite direction.
The total longtitudinal force is then the vector sum of these three forces.
Keep in mind to stop applying the braking force as soon as the speed is reduced to zero otherwise the car will end up going in reverse.
Weight Transfer An important effect when accelerating or braking is the effect of dynamic weight transfer.
When braking hard the car will nosedive.
During accelerating, the car leans back.
This is because just like the driver is pushed back in his seat when the pedal hits the metal, so is the car's centre of mass.
The effect of this is that the weight on the rear wheels increases during acceleration and the front wheels conversely have less weight to bear.
The effect of weight transfer is important for driving games for two reasons.
First of all the visual effect of the car pitching in response to driver actions adds a lot of realism to the game.
Suddenly, the simulation becomes a lot more lifelike in the user's experience.
Second of all, the weight distribution dramatically affects the maximum traction force per wheel.
For street tyres this may be 1.
Makes sense, doesn't it?
If you want to simplify see more, you could assume that the static weight distribution is 50-50 over the front and rear axle.
An engine delivers an amount of torque.
Torque is like a rotational equivalent of force.
Torque is force times distance.
If you apply a 10 Newton force at 0.
That's the same torque as when you apply a 1 N force at 3 m from the axis.
In both cases the leverage is the same.
The torque that an engine can deliver depends on the speed at which the engine is turning, commonly expressed as rpm revolutions per minute.
The relationship torque versus rpm is not a linear relationship, but is learn more here provided as a curve known as a torque curve the exact shape and height of the curve is specific for each engine type, it is determined by engine tests.
Here's an example for the 5.
The curves are only defined in the range from, in this particular case, about 1000 to 6000 rpm, because that is the operating range of the engine.
Any lower, and the engine will stall.
Any higher above the so-called "redline"and you'll damage it.
Oh, and by the way, realistic car game is the maximum torque the engine can deliver at a given rpm.
The actual torque that the engine delivers depends on your throttle position and is a fraction between 0 and 1 of this maximum.
We're mostly interested in the torque curve, but some people find the power curve also interesting.
Check for yourself in the diagram above.
And here's the same curves in SI units: Newton meter for torque and kiloWatt for power.
The curves are the same shape, but the relative scale is different and because of that they don't cross either.
Now, the torque from the engine i.
The gearing multiplies the torque from the engine by a factor depending on the gear ratios.
Unfortunately, quite some energy is lost in the process.
As games car 1 million as 30% of the energy could be lost in the form of heat.
This gives a so-called transmission efficiency of 70%.
Let me just point out that I've seen this mentioned as a typical value, I don't have actual values for any particular car.
The torque on the rear axle can be converted to a force of the wheel on the road surface by dividing by the wheel radius.
Force is torque divided by distance.
By the way, if you want to work out the radius of a tyre from those cryptic tyre identfication codes, have a look at the The Wheel and Tyre Bible.
It even provides a handy little calculator.
Here's an equation to get from engine torque to drive force: the longtitudinal force that the two rear wheels exert on the road surface.
Push the pedal down further than that and the wheels will start spinning and lose grip and the traction actually drops below the maximum amount.
So, for maximum acceleration the driver must exert an amount of force just below the friction threshold.
The subsequent acceleration causes a weight shift to the rear wheels.
The rear wheels now have extra weight which in this case is sufficient to allows the driver to put his foot all the way down.
Gear Ratios The following gear ratios apply to an Corvette C5 hardtop Source: First gear g1 2.
This will accelerate a mass of 1439 kg with 6.
The combination of gear and differential acts as a multiplier from the torque on the crankshaft to the torque on the rear wheels.
For example, the Corvette in first gear has a multiplier of 2.
This means each Newton meter of torque on the crankshaft results in 9.
Accounting for 30% loss of energy, this leaves 6.
Divide this by the wheel radius to get the force exerted by the wheels on the road and conversely by the road back to the wheels.
Let's take a 34 cm wheel radius, that gives us 6.
Of course, there's no such thing as a free lunch.
You can't just multiply torque and not have to pay something in return.
What you gain in torque, you have to pay back in angular velocity.
You trade off strength for speed.
For each rpm of the wheel, the engine has to do 9.
The rotational speed of the wheel is directly related to the speed of the car unless we're skidding.
Each revolution takes the wheel 2 pi R further, i.
So when the engine is doing 4400 rpm in first gear, that's 483 rpm of the wheels, is 8.
In low gears the gear ratio is high, so you get lots of torque but no so much speed.
In high gears, you get more speed but less torque.
You can put this in a graph as a set of curves, one for each gear, as in the following example.
Note that these curves assume a 100% efficient gearing.
The engine's torque curve is shown as well for reference, it's the bottom one in black.
The other curves show the torque on the rear axle for a given rpm of the axle!
As we've already seen, the rotation rate of the wheels can be related to car speed disregarding slip for the moment if we know the wheel radius.
Drive wheel acceleration Now beware, the torque that we can look up in the torque curves above for a given rpm, is the maximum torque at that rpm.
How much torque is actually applied to the drive wheels depends on the throttle position.
This position is determined by user input the accelerator pedal and varies from 0 to 100%.
Note that the gearbox increases the torque, but reduces the rate of rotation, especially in low gears.
How do we get the RPM?
So we need the rpm to calculate the engine's max torque and from there the engine's actual applied torque.
In other words, now we need to know has fast the engine's crankshaft is turning.
The way I do it is to calculate this back from the drive wheel rotation speed.
After all, if the engine's not declutched, the cranckshaft and the drive wheels are physically connected through a set of gears.
If we know the rpm, we can calculate the rotation speed of the drive wheels, and vice versa!
There are 60 seconds in a minute and 2 pi radians per revolution.
According to this equation, the cranckshaft rotates faster than the drive wheels.
First gear ratio is 2.
Because the torque curve isn't defined below a certain rpm, you may need to make sure the rpm is at least at some minimum value.
The wheels aren't turning so the rpm calculation would provide zero.
At zero rpm, the engine torque is either undefined or zero, depending how your torque curve lookup is implemented.
That would mean you'd never be able elvis games car get the car moving.
In real life, you'd be using the clutch in this case, gently declutching while the car starts moving.
So wheel rotation and engine rpm are more or less decoupled in this situation.
There are two ways to get the wheel rotation rate.
The first one is the easiest, but a bit of a quick hack.
The second one involves some more values to keep track of over time, but is more accurate and will allow for wheel spins, etcetera.
The easy way is to pretend the wheel is rolling and derive the rotation rate from the car speed and the wheel radius.
The more advanced way is to let the simulation keep track of the rear wheel rotation rate and how it changes in time due to the torques that act on the rear wheels.
In other words, we find the rotation rate by integrating the rotational acceleration over time.
The rotational acceleration at any particular instant depends on the sum of all the torques on the axle and equals the net torque divided by the rear axles inertia just like linear accelaration is force divided by mass.
The net torque is the drive torque we saw earlier minus the friction torques that counteract it braking torque if you're braking and traction torque from the contact with the road surface.
Slip ratio and traction force Calculating the wheel angular velocity from the car speed is only allowed if the wheel is rolling, in other words if there is no lateral slip between the tyre surface and the road.
This is true for the front wheels, but for drive wheels this is typically not true.
After all, if a wheel is just rolling along it is not transfering energy to keep the car in motion.
In a typical situation where the car is cruising at constant speed, the rear wheels will be rotating slighty faster than the front wheels.
The front wheels are rolling and therefore have zero slip.
You can calculate their angular velocity by just dividing the car speed by 2 pi times the wheel radius.
The rear wheels however are rotating faster and that means the surface of the tyre is slipping with regard to the road surface.
This slip causes a friction force in the direction opposing the slip.
The friction force will therefore be pointing to the front of the car.
In fact, this friction force, this reaction to the wheel slipping, is what pushes the car forwards.
This friction force is known as traction or as the longtitudinal force.
The traction depends on the amount of slip.
This particular definition also works for cars driving in reverse.
Slip ratio is zero for a free rolling wheel.
For a car braking with locked wheels the slip ratio is -1, and a car accelerating forward has a positive slip ratio.
It can even be larger than 1 of there's a lot of slip.
The relationship between longtitudinal forward force and slip ratio can be described by a curve such as the following: Note how the force is zero if the wheel rolls, i.
The exact curve shape may vary per tyre, per road surface, per temperature, etc.
That means a wheel grips best with a little bit of slip.
Beyond that optimum, the grip decreases.
That's why a wheel disney pixar games cars, impressive as it may seem, doesn't actually give you the best possible acceleration.
There is so much slip that the longtitudinal force is below its peak value.
Decreasing the slip would give you more traction and better acceleration.
The longtitudinal force has as good as a linear dependency on load, we saw that earlier when we dicussed weight transfer.
So instead of plotting a curve for each particular load value, we can just create one normalized curve by dividing the force by the load.
To get from normalized longtitudinal force to actual longtitudinal force, multiply by the load on the wheel.
Cap the force to a maximum value so that the force doesn't increase after the slip ratio passes the peak value.
If you plot that 3d games play cars a curve, you get the following: Torque on the drive wheels To recap, the traction force is the friction force that the road surface applies on the wheel surface.
If the brake is applied this will cause a torque as well.
For the brake, I'll assume it delivers a constant torque in the direction opposite to the wheel' s rotation.
Take care of the direction, or you won't be able to brake when free car games for play reversing.
The following diagram illustrates this for an accelerating car.
The engine torque is magnified by the gear ratio and the differential ratio and provides the drive torque on the rear wheels.
The angular velocity of the wheel is high enough that it causes slip between the tyre surface and the road, which can be expressed as a positive slip ratio.
This results in a reactive friction force, known as the traction force, which is what pushed the car forward.
The traction force also results in a traction torque on the rear wheels which opposes the drive torque.
In this case the net torque is still positive and will result in an acceleration of the rear wheel rotation rate.
This will increase the rpm and increase the slip ratio.
If the driver is not braking, the brake torque is zero.
This torque will cause an angular acceleration of the drive wheels, just like a force applied on a mass will cause it to accelerate.
A positive angular acceleration will increase the angular velocity of the rear wheels over time.
This way we can determine how fast the drive wheels are turning and therefore we can calculate the engine's rpm.
The Chicken and the Egg Some people get confused at this point.
We need the rpm to calculate the torque, but the rpm depends on the rear wheel rotation rate which depends on the torque.
Surely, this is a circular definition, a chicken and egg situation?
This is an example of a Differential Equation: we have equations for different variables that mutually depend on each other.
But we've already seen another example of this before: air resistance depends on speed, yet the speed depends on air resistance because that influences the acceleration.
To solve differential equations in computer programs we use the technique of numeric integration: if we know all the values at time t, we can work out the values at time t + delta.
In other words, rather than trying to solve these mutually dependent equations by going into an infinite loop, we take snapshots in time and plug in values from the previous snapshot to work out the values of the new snapshot.
Just use the old values from the previous iteration to calculate the new values for the current iteration.
If the time step is small enough, it will give you the results you need.
There's a lot of theory on differential equations and numeric integration.
One of the problems is that a numeric integrator can "blow up" if the time step isn't small enough.
Instead of well-behaved values, they suddenly shoot to infinity because small errors are multiplied quickly into larger and larger errors.
Decreasing the time step can help, but costs more cpu cycles.
An alternative is to use a smarter integrator, e.
For more information on this topic, see my article on numerical stability: Curves Okay, enough of driving in a straight line.
How about some turning?
One thing to keep in mind is that simulating the physics of turning at games online for cars speed is different from turning at high speed.
At low speeds parking lot manoeuvresthe wheels pretty much roll in the direction they're pointed at.
To simulate this, you need some geometry and some kinetics.
You don't really need to consider forces and mass.
In other words, it is a kinetics problem not a dynamics problem.
At higher speeds, it becomes noticeable that the wheels can be heading in one direction while their movement is still in another direction.
In other words, the wheels can sometimes have a velocity that is is not aligned with the wheel orientation.
This means there is a velocity car physics games download that is at a right angle to the wheel.
This of course causes a lot of friction.
After all a wheel is designed to roll in a particular direction and that without too much effort.
Pushing a wheel sideways is very difficult and causes a lot of friction force.
In high speed turns, wheels are being pushed sideways and we need to take these forces into account.
Let's first look at low speed cornering.
In this situation we can assume that check this out wheels are moving in the direction they're pointing.
The wheels are rolling, but not slipping sideways.
If the front wheels are turned at an angle delta and the car is moving at a constant speed, then the car will describe a circular path.
Imagine lines projecting from the centre of the hubcabs of the front and rear wheel at the inside of the curve.
Where these two lines cross, that's the centre of the circle.
This is nicely illustrated in the following screenshot.
Note how the green lines all intersect in one point, the centre round which the car is turning.
You may also notice that the front wheels aren't turned at the same angle, the outside wheel is turned slightly less than the inside wheel.
This is also what happens in real life, the steering mechanism of a car is designed to turn the wheels at a different angle.
For a car simulation, this subtlety is probably not so important.
I'll just concentrate on the steering angle of the front wheel at the inside of the curve and ignore the wheel at the other side.
This is a screen shot from a car physics demo by Rui Martins.
More illustrations and a download can be found at The radius of the circle can be determined via geometry as in the following diagram: The distance between front and rear axle is known at the wheel base and denoted as L.
The radius of the circle that the car describes to be precise the circle that the front wheel describes is called R.
The diagram shows a triangle with car physics games download vertex in the circle centre and one car physics games download the centre of each wheel.
The angle at the rear wheel is 90 degrees per definition.
The angle at the front wheel is 90 degrees minus delta.
This means the angle at the circle centre is also delta the sum of the angles of a triangle is always 180 degrees.
The sine of this angle is the wheel base divided by the circle radius, therefore: Continue reading that if the steering angle is zero, car games loading the circle radius is infinite, i.
Okay, so we can derive the circle radius from the steering angle, now what?
Well, the next step is to calculated the angular velocity, i.
Angular velocity is usually represented using the Greek letter omegaand is expressed in radians per second.
A radian is a full circle divided by 2 pi.
It is fairly simple to determine: if we're driving circles at a constant speed v and the radius of the circle is R, how long does it take to complete one circle?
That's the circumference divided by the speed.
In the time the car has described a circular path it has also rotated around its up-axis exactly once.
In other words: By using these last two equations, we know how fast the car must turn for a given steering angle at a specific speed.
For low speed cornering, that's all we need.
The steering angle is determined from user input.
The car speed is determined as for the straight line cases the car physics games download vector always points in the car direction.
From this we calculate the circle radius and the angular velocity.
The angular velocity is used to change the car orientation at a specific rate.
The car's speed is unaffected by the turn, the velocity vector just rotates to match the car's orientation.
High Speed Turning Of course, there are not many games involving cars that drive around sedately apart from the legendary Trabant Granny Racer .
Gamers are an impatient lot and usually want to get somewhere in a hurry, preferably involving some squealing of tires, grinding of gearboxes and collateral damage to the surrounding environment.
Our goal is to find a physics model that will allow understeer,oversteer, skidding, handbrake turns, etc.
At high speeds, we can no longer assume that wheels are moving in the direction they're pointing.
They're attached to the car body which has a certain mass and takes time to react to steering forces.
The car body can also have an angular velocity.
Just like linear velocity, this takes time to build up or slow down.
This is determined by angular acceleration which is in turn dependent on torque and inertia which are the rotational equivalents of force and mass.
Also, the car car physics games download will not always be moving in the direction it's heading.
The car may be pointing one way but moving another way.
Think of rally drivers going through a curve.
The angle between the car's orientation and the car's velocity vector is known as the sideslip angle beta.
Now let's look at high speed cornering from the wheel's point of view.
In this situation we need to calculate the sideways speed of the tires.
Because wheels roll, they have relatively low resistance to motion in forward or rearward direction.
In the perpendicular direction, however, wheels have great resistance to motion.
Try pushing a car tire sideways.
This is very hard because you need to overcome the maximum static friction force to get the wheel to slip.
In high speed cornering, the tires develop lateral forces also known as the cornering force.
This force depends on the slip angle alphawhich is the angle between the tire's heading and its direction of travel.
As the slip angle grows, so does the cornering force.
The cornering force per tire also depends on the weight on that tire.
If you'd like to see this explained in a picture, consider the following one.
The velocity vector of the wheel has angle alpha relative to the direction in which the wheel can roll.
We can split the velocity vector v up into two component vectors.
Movement in this direction corresponds to the rolling motion of the wheel.
There are three contributors to the slip angle of the wheels: the sideslip angle of the important free online rally car games think, the angular rotation of the car around the up axis yaw rate and, for the front wheels, the steering angle.
The sideslip angle b bèta is the difference between the car orientation and the direction of movement.
In other words, it's the angle between the longtitudinal axis and the actual direction of travel.
So it's similar in concept to what the slip angle is for the tyres.
Because the car may be moving in a different direction than where it's pointing at, it experiences a sideways motion.
This is equivalent to the perpendicular component of the velocity vector.
If the car turns full circle, the front wheel describes a circular path of distance 2.
Note the sign reversal.
To express this as an angle, take the arctangent of the lateral velocity divided by the longtitudinal velocity just like we did for beta.
The steering angle delta is the angle that the front wheels make relative to the orientation of the car.
There is no steering angle for the rear wheels, these are always in line with the car body orientation.
If the car is reversing, the effect of the steering is also reversed.
The slip angles for the front and rear wheels are given by the following equations: The https://fonstor.ru/car-games/car-bashing-games-online.html force exercised by the tyre is a function of the slip angle.
In fact, for real tyres it's quite a complex function once again best described by curve diagrams, such as the following: What this diagram shows is how much lateral sideways force is created for any particular value of the slip angle.
This type of diagram is specific to a particular type of tyre, this is a fictitious but realistic example.
The peak is at about 3 degrees.
At that point the lateral force even slightly exceeds the 5KN load on the tyre.
This diagram is similar to the slip ratio curve we saw earlier, but don't confuse them.
The slip ratio curve gives us the forward force depending on amount of longtitudinal slip.
This curve gives us the sideways lateral force depending on slip angle.
The lateral force not only depends on the slip angle, but also on the load on the tyre.
This is a plot for a load of 5000 N, i.
Different curves apply to different loads because the weight changes the tyre shape and therefore its properties.
But the shape of the curve is very similar apart from the scaling, so we https://fonstor.ru/car-games/really-free-online-games-car.html approximate that the lateral force is linear with load and create a normalized lateral force diagram by dividing the lateral force by the 5KN of load.
This is the slope of the diagram at slip angle 0.
If you want a better approximation of the the relationship between slip angle and lateral force, search for information on the so-called Pacejka Magic Formula, names after car physics games download Pacejka who developed this at Delft University.
That's what tyre physicists use to model tyre behaviour.
It's a set of equations with lots of "magic" constants.
By choosing the right constants these equations provide a very good approximation of curves found through tyre tests.
The problem is that tyre manufactors are very secretive about the values of these constants for actual tyres.
So on the one hand, it's a very accurate modeling technique.
On the other hand, you'll have a car physics games download time finding good tyre data to make any use whatsoever of that accuracy.
The lateral forces of the four tyres have two results: a net cornering force and a torque around the yaw axis.
The cornering force is the force on the CG at a right angle to the car orientation and serves as the centripetal force which is required to describe a circular game free car driving />The contribution of the rear wheels to the cornering force is the same as the lateral force.
For the front wheels, multiply the lateral force with cos delta to allow for the steering angle.
After all, it would look very silly if the car is describing a circle but keeps pointing in the same direction.
The cornering force makes sure the CG describes a circle, but since it operates on a point mass it does nothing about the car orientation.
That's what we need the torque around the yaw axis for.
Torque is force multiplied by the perpendicular distance between the point where the force is applied and the pivot point.
Note that the sign differs.
Applying torque on the car body introduces angular acceleration.
The inertia for a rigid body is a constant which depends on its mass and geometry and the distribution of the mass within its geometry.
Engineering handbooks provide formulas for the inertia of common shapes such as spheres, cubes, etc.
Epilogue You can a demo car demo v0.
Or easier yet, try the by Marcel "Bloemschneif" Sodeike!
If you spot mistakes in this tutorial or find sections that could do with some clarification, let me know.
Car specifications It's handy to know what sort of values to use for all these different constants we've seen.
Preferably some real values from some real cars.
I've collected what I could for a.
Units and Conversions The following S.
A pound is a unit of force and a kilogram is a unit of mass.
What we mean by this "conversion" is that one pound of weight which is a force equals the weight exerted by 0.
On the moon, a kilogram will weigh less but still have the same mass.
Unit converter on the web: Marco Monster E-mail: Website: Copyright 2000-2003 Marco Monster.
This tutorial may not be copied or redistributed without permission.