First slide

Friction on horizontal surface

Question

Which one of the following statements is incorrect?

Easy

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.

Solution

Coefficient of sliding friction has no dimension.
$f = μ_{s} N \Rightarrow μ_{s} = \frac{f}{N}$

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