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JEE Main & Advanced Physics NLM, Friction, Circular Motion Question Bank Static and Limiting Friction

  • question_answer
    A uniform metal chain is placed on a rough table such that one end of chain hangs down over the edge of the table. When one-third of its length hangs over the edge, the chain starts sliding. Then, the coefficient of static friction is                         [Kerala PET 2005]            

    A)                         \[\frac{3}{4}\]          

    B)                           \[\frac{1}{4}\]            

    C)             \[\frac{2}{3}\]            

    D) \[\frac{1}{2}\]

    Correct Answer: D

    Solution :

                    \[{{\mu }_{s}}=\frac{\text{Lenght  of the chain hanging from the table }}{\text{Length of the chain lying on the table}}\]                                     \[=\frac{l/3}{l-l/3}=\frac{l/3}{2l/3}=\frac{1}{2}\]


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