# About Tire Friction and Torque

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As far as I get it:

-if friction is low and torque is low, than possible force is gone be low

-if friction is low and torque is high, than possible force is gone be low, but a bit higher

-if friction is high and torque is low, than possible force is gone be very low and the car will have difficulties to go

-if friction is high and torque is high, than possible force will be high and car will accelerate fast

Am I right about it or does it work different? I just thought that if friction is high and torque is low than the resistance is so high that wheels have trouble to turn fast enaugh. That's why I think that in that high-friction case it will be even worse than having low friction tires on the same car. Is it true or not true?

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It depends on the surface you are driving on. The car physics in my SDK example (Forest) is using the Stribeck friction model. The "dry" friction decreases exponentially from losing grip with the hard asphalt while the "wet" friction increases linearly with velocity when there is gravel, mud and water. Because the rubber may move a bit, there is always some "wet" friction. The velocity is relative between the two contact points so you have to take the wheel's spinning into the point velocity.

Public Function FrictionFromSpeed(Speed As Single, F As AdvancedFriction, Mass As Single, TimeStep As Single) As Single
If Speed < F.Treshold Then
FrictionFromSpeed = Min_Float(((F.Base ^ Speed) * F.Stribeck) + (Speed * F.Viscous), Speed * Mass * TimeStep)
Else
FrictionFromSpeed = Min_Float(Min_Float(Speed * F.Viscous, F.MaxViscous), Speed * Mass * TimeStep)
End If
End Function
Edited by Dawoodoz

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