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Question

A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is

A
2 N
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B
20 N
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C
50 N
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D
100 N
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Solution

The correct option is A 2 NGiven horizontal force F=10 N and coefficient of friction between block and wall (μ)=0.2. We know that at equilibrium the horizontal force provides the normal reaction to the block against the wall. Therefore, the normal reaction to the block (R)=F=10 N We also know that weight of the block (W)= Frictional force =μR=0.2×10=2 N Hence, the correct answer is option (a).

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