Question

A rear wheel drive car accelerates from rest such that all the wheels roll without slipping and start moving to the right. what is the direction and kind of the friction force on rear wheels?

(a)To the right static friction

(b) to the left static friction

(c) to the right kinetic friction

(d) to the left kinetic friction

Answer 1

(b) to the left static friction

explanation

When there is friction on the rear wheels, friction opposes the sliding of the rear wheels this motion, so it must point opposite to the way the car is going. Again, it must be static friction.

The static friction force on the front wheels accelerates the car forward. This much smaller friction force on the rear wheels merely provide sufficient torque to give the rear wheels the correct angular acceleration.

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