Question

If ${\mu }_r,{\mu }_k$ and ${\mu }_s$ represent the coefficients of rolling friction, kinetic friction and static friction, then

• A. ${\mu }_r>{\mu }_k>{\mu }_s$
• B. ${\mu }_r<{\mu }_k>{\mu }_s$
• C. ${\mu }_r<{\mu }_k<{\mu }_s$
• D. ${\mu }_r>{\mu }_k<{\mu }_s$

Answer 1

The correct option is C ${\mu }_r<{\mu }_k<{\mu }_s$

Static friction is strongest, followed by sliding friction, and then rolling friction.