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  • Which one of the following statements is incorrect? Rolling friction is smaller than sliding friction. Limiting value of static friction

Which one of the following statements is incorrect?

(1) Rolling friction is smaller than sliding friction 

(2) Limiting value of static friction is directly proportional to normal reactions 

(3) Frictional force opposes the relative motion 

(4) Coefficient of sliding friction has dimensions of the length

Answers (1)

\\\text{Sliding friction is given by }F=\mu N \quad$ or $\mu=\frac{F}{N}$ \\ Force and Normal reaction both are given by newton, so the $\mu$ is dimensionless. Therefore, statement $\mathrm{D}$ is wrong.

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