Which one of the following statements concerning the static and kinetic friction

Question

Which one of the following statements concerning the static and kinetic frictional forces is correct? The static frictional force acts on an object when it is stationary and the kinetic frictional force acts on it when it is sliding. When an object is sliding, only the static frictional force acts on it. When an object is stationary, both static and kinetic frictional forces are acting on it. Static and kinetic frictional forces act in the same direction as the normal force. When an object is stationary, only the kinetic frictional force acts on it.

Explanation / Answer

Solution:

First statement is correct i.e the static friction force acts on an object when it is stationary and the kinetic friction force acts when it is sliding.

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