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Question

Two blocks A and B are placed one over the other on a smooth horizontal surface. The maximum horizontal force that can be applied on the upper block B, so that A and B move without separation is 49N. The coefficient of friction between A and B is:
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A
0.2
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B
0.3
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C
0.5
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D
0.8
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Solution

The correct option is C 0.5
Given, F=49 N,MA=7kg,MB=3kg,μ=?
Equation of motion of two blocks-system
Fmax=μ(MA+MB)g
μ=F(MA+MB)g
=49(7+3)98
=4910×98
=0.5.

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