A minimum 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
100N
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B
50N
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C
20N
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D
2N
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Solution
The correct option is D2N Given The reaction force, N=10N Coefficient of friction μ=0.2 The weight of block is W=mg Also, F=mg ⇒W=F...............(1) where, m is mass of the block and g is acceleration due to gravity. Now, the force due to friction is F=μN .................(2) From (1) and (2) we get and as block is stationary W=μN W=(0.2)(10) W=2N