Figure shows two blocks A and B pushed against the wall with the force F. The wall is smooth but the surfaces in contact of A and B are rough. Which of the following is true for the system of blocks to be at rest against wall?

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F should be equal to weight of A and B

F should be less than weight of A and B

F should be more than weight of A and B

System cannot be in equilibrium (at rest).

answer is D.

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Detailed Solution

For system A and B together there is no upward force to balance the weight (mA+mB) g. So, system can never be in equilibrium.

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