Which one of the following statements is incorrect?

Which one of the following statements is incorrect?

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

Solution

∵ f_{\lim} = μ_{s} N

\Rightarrow μ_{s} = \frac{f_{\lim}}{N}

Coefficient of sliding friction has no dimension

Asked in: NEET 2018

Practice more Laws of Motion questions on Aicharya