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Question

A block of mass 0.1 kg is held against a wall applying horizontal force of 5 N on the block. If coeff. of friction between the block and the wall is 0.5, the magnitude of frictional force acting on the block is

A
2.5 N
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B
0.49 N
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C
0.98 N
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D
4.9 N
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Solution

The correct option is C 0.98 N
frictional force (f) is;

f=mg

if μf>mg

μf=0.5×5=2.5

mg=0.1×9.8=0.98

Hence limiting friction is 2.5

Hence, frictional force acting on the block is;

f=mg=0.1×9.8=0.98N


981482_759015_ans_f8b72fdd6d2547bba24e670f96c95692.png

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