Which one of the following statements is incorrect? (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: (d). (a) Rolling friction is much smaller than sliding friction: correct. (b) fs,max = μs N, so it is proportional to N: correct. (c) Friction opposes relative motion: correct. (d) μ = f/N is a ratio of two forces, so it is dimensionless: incorrect. So the answer is (d).

Which one of the following statements is incorrect? | NEET 2018

Q24NEET 2018Easy

Friction Basics

Which one of the following statements is incorrect?

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Answer: (d)

(a) Rolling friction is much smaller than sliding friction: correct.
(b) $f_{s,max} = \mu_s N$ , so it is proportional to $N$ : correct.
(c) Friction opposes relative motion: correct.
(d) $\mu = f/N$ is a ratio of two forces, so it is dimensionless: incorrect.
So the answer is (d).

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