. A chain of length L is placed on a horizontal surface as shown in figure. At any instant x is the length of chain on rough surface and the remaining p


A. the magnitude of P should increase with time 

B. the magnitude of P should decrease with time 

C. the magnitude of P should increase first and then decrease with time 

D. the magnitude of P should decrease first and then increase with time 

Best Answer

(a)

For chain to move with constant speed P needs to be equal to frictional force on the chain. As the length of chain on the rough surface increases. Hence the friction force
fk = μk N increases.

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