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

  • question_answer
    Two masses A and B of 10 kg and 5 kg respectively are connected with a string passing over a frictionless pulley fixed at the corner of a table as shown. The coefficient of static friction of A with table is 0.2. The minimum mass of C that may be placed on A to prevent it from moving is      [MP PET 1984]                        

    A)                         15 kg            

    B)                         10 kg            

    C)                         5 kg            

    D)                         12 kg

    Correct Answer: A

    Solution :

                                For limiting condition \[\mu =\frac{{{m}_{B}}}{{{m}_{A}}+{{m}_{C}}}\]Þ \[0.2=\frac{5}{10+{{m}_{C}}}\]             Þ \[2+0.2{{m}_{C}}=5\]Þ \[{{m}_{C}}=15kg\]            


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