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Question

# A block A of mass 2kg 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 of 25 N is applied on the block B. The force of friction between A and B is:

A
Zero
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B
3.9N
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C
5.0N
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D
49N
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Solution

## The correct option is A ZeroAnswer: A. (zero.)The maximum static frictional force that can be provided by the floor is 0.5×(2+8)×g=50NA 25 N force will not move the system and hence the force of friction between A and B will be 0.

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