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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.

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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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