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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