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# [Car Physics] - Wheels rotation with traction force

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### #1jujunosuke  Members   -  Reputation: 188

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Posted 16 May 2012 - 08:05 PM

Hi everyone !

In my current racing simulation, for a RWD car, the front wheels rotation speed is calculated with the local z velocity of the car.
This work well from now, but my simulation is getting more complex now, and i was wondering if calculating the front wheels rotation with the ground friction was a good idea ?

For example, rear wheels acceleration push the car forward and move the car.
Then, i would accelerate the front wheels with the traction force (frontWheelsAngularVelocity vs ground speed).

Is this a good approach to calculate the wheels that are not linked with the drive train ?

I know that this is a very specific question but, any feedback or discussion about this is welcome.

Best regards !

### #2kunos  Crossbones+   -  Reputation: 2207

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Posted 16 May 2012 - 11:32 PM

ya, undriven wheels have their own angular inertia and are affected by the same forces and torques you have at the driven wheels (minus, of course, the driving torque from the engine).
Stefano Casillo
AssettoCorsa - netKar PRO - Kunos Simulazioni

### #3jujunosuke  Members   -  Reputation: 188

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Posted 16 May 2012 - 11:55 PM

One more time Kunos thank you !

I will try to apply this new approach to my simulation and see if everything works and looks fine.
Kunos, my car sim is getting better, i plan to release a demo quite soon (I still don't know when exactly tho). Be sure to check your gamedev private message because you will be the first one to receive it !

Cheers !
Best regards.

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