JEE Main & Advanced Physics NLM, Friction, Circular Motion Sample Paper Topic Test - Friction

  • question_answer
    A block of mass 10 kg is kept on the fixed incline having coefficient of friction 0.8. Find the force of friction exerted on the block by inclined:

    A) 100 N               

    B) 64 N            

    C) 80 N                            

    D) 60 N

    Correct Answer: D

    Solution :

    Friction required \[=\,\,mg\,\sin \,37{}^\circ \]
    \[=10\times 10\times \frac{3}{5}=60\,N\]
    Maximum friction provided  \[=\mu \,mg\,\cos \,37{}^\circ \]
    \[=0.8\times 10\times 10\times \frac{4}{5}=64\,\,N\]
    So friction force will be 60 N.

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