We have mentioned about static friction between road and the tyers.Why is it static? What about the kinetic friction between road and the tyers?
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It is because the patch of rubber that is actually touching the road is not moving with respect to the road. It is static (for a very brief period every revolution).
As the patch flattens out on the road, there is a tiny bit of relative motion, which is part of that rolling friction, but the whole patch is not sliding, so it’s not kinetic friction (unless you have slammed on the brakes and the wheels are screeching or you are cornering so hard the tires are slipping).
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