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Q.

A block of mass 3 kg is placed on a rough horizontal surface (μs = 0.4). A force of 8.7 N is applied on the block. The force of friction between the block and floor is

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a

8.7 N

b

12 N

c

10 N

d

zero

answer is A.

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Detailed Solution

fms = μsmg = 0.4×3×10 N = 12 NSince the applied force is less than limiting friction, therefore the force of friction is equal to the applied force.f = 8.7 N
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