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KVPY Sample Paper KVPY Stream-SX Model Paper-1

  • question_answer
    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 portion lies on smooth surface. Initially x = 0. A horizontal force P is applied to the chain (as shown in figure). In the duration x changes from x = 0 to x = L, for chain to move with constant speed.

    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

    Correct Answer: A

    Solution :

    [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 \[{{f}_{k}}={{\mu }_{k}}N\] increases.


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