A block A of mass 2 kg rests on another block B of mass 8kg which rests on a horizontal floor. The coefficient of friction between A and B is 0.2 while that between B and floor is 0.5 . When a horizon

Question

A block A of mass 2 kg rests on another block B of mass 8kg which rests on a horizontal floor. The coefficient of friction between A and B is 0.2 while that between B and floor is 0.5 . When a horizontal force F of 25N is applied on the block B, the force of friction between A and B is ____.

TestHub · Accepted Answer

Maximum friction between B and the floor: $0.5 \times (2 + 8) \times 10 = 50$ N

Applied force $25$ N $< 50$ N, so neither block moves

With no tendency of relative motion between A and B, friction between A and B is $0$ N

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