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Q.

A block of mass 5 kg is placed on a rough horizontal plane. A time dependent horizontal force F = (t2+2t)N acts on the block. The friction force between the block and the plane at t = 3 s is ( µ = 0.4)

 

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a

8N

b

Zero

c

20 N

d

15 N

answer is B.

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Detailed Solution

F = t2 + 2t

fL = µ mg = 0.4 x 5 x 10 = 20 N

if t = 3

F = (32 + 2 x 3 ) N = 15 N < fL

.: fs = Fapp = 15 N

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