Q.

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

Moderate

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a

20 N

b

50 N

c

100 N

d

2 N

answer is 4.

(Detailed Solution Below)

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Detailed Solution

Let R be the normal contact force by wall on the block.     R=10N     F=w  and  F=μR∴ μR=wor  w=0.2×10=2N
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