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NEET Sample Paper NEET Sample Test Paper-88

  • question_answer
    A block B of mass 4 kg is placed on a rough horizontal plane. A time dependent horizontal force \[f=kt\] acts on the block, k \[=2\,N/{{s}^{2}}.\] The frictional force between the block and the plane at \[t=2\]sec is \[(\mu =0.2)\]

    A) 4 N      

    B)                    8 N  

    C) 12 N                

    D)        zero

    Correct Answer: A

    Solution :

    [a] At \[t=2\,\sec ,\] \[F=2\times 2=4\,\,N,\] where as \[{{f}_{\max }}={{\mu }_{N}}=8N.\] As the applied force is less than the limiting force of friction, the frictional force will be equal to applied force i.e. \[F=2\times 2=4\,N\]


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