Home Physics Newton's Laws of Motion NEET Previous Year Question Which one of the following statements is inc…
Physics Newton's Laws of Motion NEET Previous Year Question MCQ (Single Correct)

Which one of the following statements is incorrect? [NEET 2018]

A
Frictional force opposes the relative motion
B
Limiting value of static friction is directly proportional to normal reaction
C
Rolling friction is smaller than sliding friction
D
Coefficient of sliding friction has dimensions of length

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The correct answer is:
D

The coefficient of sliding is given as, where, N is the normal reaction and

is the sliding force. As, the dimensions of N and are same. Thus, is a dimensionless quantity.

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