A block can slide with friction on a table. It is connected to a spring which is

Question

A block can slide with friction on a table. It is connected to a spring which is attached to a wall. The spring is initially in equilibrium (i.e. neither stretched nor compressed). You push the block away from the equilibrium point of the spring and release it. The block will move back toward equilibrium and eventually (maybe after a few oscillations) again settle at the equilibrium point due to friction. Analyze the work done by the different forces Ws (spring), Wf (friction), Wh (hand) in the entire process from the equilibrium point back to the equilibrium point.

A. Since friction is involved and is non-conservative the net work Ws+Wf+Wh is not zero

B. Ws = 0. Wf < 0. Wh > 0, and Wh precisely cancels Wf. In particular the net work is zero, Ws+Wf+Wh = 0

C. The net work is zero, Ws+Wf+Wh = 0, but we can not make further statements about the individual contributions of work without more information

D. Ws = 0. Wf > 0, Wh < 0 and Wh precisely cancels Wf. In particular the net work is zero, Ws+Wf+Wh = 0.

Explanation / Answer

option c is correct

net work is zero because the block attaining its initial position so what ever the forces acting on it it comes to same pposition. and

Ws+Wf+Wh = 0, but we can not make further statements about the individual contributions of work without more information

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