Q.

Which one of the following statements is incorrect?

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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.

answer is D.

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Detailed Solution

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