A horizontal force of 10N 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
2N
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B
20N
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C
50N
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D
100N
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Solution
The correct option is A2N Given horizontal force F=10N 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=10N
We also know that weight of the block (W)= Frictional force =μR=0.2×10=2N
Hence, the correct answer is option (a).