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A 4 kg block A is placed on 8 kg block B...

A 4 kg block A is placed on 8 kg block B which rests on a smooth table. Block A just slips on B when a force of 12 N is applied on A. What is the maximum horizontal force F on B required to make both A and B move together?

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The correct Answer is:
24 N
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Knowledge Check

  • A block of mass m_(2) is placed on a horizontal table and another block of mass m_(1) is placed on top of it. An increasing horizontal force F = at is exerted on the upper block but the lower block never moves as a result. If the co-efficient of friction between the blocks is mu_(1) and that between the lower block and the table is mu_(2) , then what is the maximum possible value of mu_(1)//mu_(2) ?

    A
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    B
    `1+(m_(2))/(m_(1))`
    C
    `(m_(1))/(m_(2))`
    D
    `1+(m_(1))/(m_(2))`

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