Suppose that a block is pulled at a constant velocity with a constant force in t

Question

Suppose that a block  is pulled at a constant velocity with a constant force in the presence of sliding friction.  Answer the questions carefully.

(a)    What is the net force on the block while it is moving at a constant velocity from point a to point b? Explain how you arrived at your answer.

(b)   What is the net work done on the block while it is moving from point a to point b? Explain how you arrived at your answer.

(c)    What is the change in the kinetic energy of the block as it moves from point a to point b at a constant velocity? Explain how you arrived at your answer.

(d)   Does the Net Work-Kinetic Energy Theorem hold for this situation where friction is present?

Explanation / Answer

a) Zero : As because the body is moving with constant speed ie 0 accelaration, Thus net force must be zero.

b) Zero : As the net work done is change in kinetic energy. Since the speed of the body has not changed from a to b, thus the kinetic energy also remained constant, resulting in zero change, and thus zero work done

c) Zero : As the net work done is change in kinetic energy. Since the speed of the body has not changed from a to b, thus the kinetic energy also remained constant, resulting in zero change, and thus zero work done

d) Yes : it applies in any situation, but you have to take sum of work done by all forces, here including work done ny friction

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