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Question

Block A is placed on block B, whose mass is greater than that of A. There is friction between the blocks, while the ground is smooth. A horizontal force P, increasing linearly with time, begins to act on A. The accelerations a1 and a2 of A and B respectively are plotted against time (t). Choose the correct graph.


A
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B
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C
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D
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Solution

The correct option is B
The two blocks will move together with the same acceleration as long as the force of friction between them is less than the limiting friction value.
ac=Pmass of A+B
After limiting friction is reached, the acceleration of B becomes constant a2=flmass of B
Acceleration of A continues to increase linearly.
a1=Pflmass of A

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