Questions  

Which one of the following statements is incorrect?

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By Expert Faculty of Sri Chaitanya
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a
Rolling friction is smaller than sliding friction.
b
Limiting value of static friction is directly proportional to normal reaction.
c
Frictional force opposes the relative motion.
d
Coefficient of sliding friction has dimensions of length.
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detailed solution

Correct option is D

Coefficient of sliding friction has no dimension.f=μsN⇒μs=fN


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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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