A wood block sits on an angled concrete ramp. A person stands at the bottom of the ramp and pushes on the block so that a non-zero force is applied parallel to the angled surface of the ramp. Assume that we can neglect air resistance. For this scenario, which of the following statements about friction is false? A. If the block is moving, then the force due to friction is independent of how hard the person is pushing.
B. The force due to friction depends on the mass of the block, regardless of whether the block is moving or stationary.
C. If the block is not moving, then the force due to friction depends on how hard the person is pushing.
D. If the block is not moving, then the force due to friction must be zero.
E. The force due to friction depends on the angle of the ramp, regardless of whether it is moving or stationary

D. If the block is not moving, then the force due to friction must be zero.

Explanation:

If the block is not moving , it does not mean that friction on the block is not acting . Friction acts both in case when the body is moving on a rough surface or it tends to move on a rough surface . When a body tends to move on a rough surface due to  a force acting on it , friction force is equal to applied force . This friction force is known as static friction .

All other given statements are correct . Static friction depends upon force applied on the body and kinetic friction does not depend on force applied when the force acts parallel to the surface .

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

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