Which one of the following statements is incorrect ?

Question

Which one of the following statements is incorrect ? (A) Coefficient of sliding friction has dimensions of length. (B) Rolling friction is smaller than sliding friction. (C) Frictional force opposes the relative motion. (D) Limiting value of static friction is directly proportional to normal reaction.

Tardigrade Admin · Accepted Answer

Coefficient of sliding friction has no dimension. f = μs N ⇒ μs = (f/N)

Q. Which one of the following statements is incorrect ?

Coefficient of sliding friction has dimensions of length.

Rolling friction is smaller than sliding friction.

Frictional force opposes the relative motion.

Limiting value of static friction is directly proportional to normal reaction.

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

Q. Which one of the following statements is incorrect ?

Coefficient of sliding friction has dimensions of length.

Rolling friction is smaller than sliding friction.

Frictional force opposes the relative motion.

Limiting value of static friction is directly proportional to normal reaction.

Coefficient of sliding friction has no dimension. f=μs​N ⇒μs​=Nf​

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