A force pushes a block along a horizontal surface against a force of friction _f. If the block undergoes a displacement s at constant velocity, the work done by the resultant force on the block A) is equal to the work done by the force of friction _f B) is given by W = · C) increases the kinetic energy of the block. D) increases the potential energy of the block. E) is zero.

Question

Quizplus · Accepted Answer

Since the block is moving at a constant velocity, the net work done on it is zero. Therefore, the work done by the pushing force is equal in magnitude and opposite in direction to the work done by the force of friction. The potential energy of the block is not changing in this scenario, and since the kinetic energy is constant, the work done by the resultant force cannot increase it.

A Force Pushes a Block Along a Horizontal Surface