Question

Choose the correct statement(s) about the frictional force between two solid surfaces in contact

• A. Static friction is a variable force
• B. $\stackrel{-}{f_{lim}}={\mu }_s\stackrel{-}{N}$ (where symbols have their usual meanings)
• C. Kinetic friction is self adjusting
• D. None of these

Answer 1

Answer: (A), (B)

The correct options are
A Static friction is a variable force
B $\stackrel{-}{f_{lim}}={\mu }_s\stackrel{-}{N}$ (where symbols have their usual meanings)

Important points about the frictional force:-

A) Static friction is a variable force

B) $f_{lim}={\mu }_{s}N$

C) Static friction is considered as a self- adjusting.

From the given option,

Option A and B are correct option.