10 pointsSa A block can slide with friction on a table It is connected to a spri

Question

10 pointsSa A block can slide with friction on a table It is connected to a spring which is atached to a wal. The spring is initially in equilbrium(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 oscilations) again settle at the equilibrium point due to friction. Analyze the work done by the diter ent forces lig (spring·m (friction. wh (hand) n the entire process from the equilibrium point back to the equilibrium point Since friction is involved and is non-conservative the net work W+wy iWh is not zero B The net work is zero, Ws+WWh-0, but we can not make further statements about the individual contributions of work without more information C. ie c w's = o. wt > 0, wh

Explanation / Answer

since the frictional force is a dissipative force,it always acts opposite to the direction of displacement so that the body will loose energy and comes to rest Finally

So accordingly the work done by the frictional force is negative that is < 0

and Hand will do work in the direction of displacement hence Work done by hand is positive

Wh > 0

since the displacement is zero,work done by the spring is zero

hence the correct statement is

D)

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