Question

If ${\mu }_k$ is coefficient of kinetic friction and ${\mu }_S$ is coefficient of static friction, then

• A. ${\mu }_k<{\mu }_S$
• B. ${\mu }_S<{\mu }_k$
• C. ${\mu }_k={\mu }_S$
• D. ${\mu }_S\le {\mu }_k$

Answer 1

The correct option is A ${\mu }_k<{\mu }_S$

If ${\mu }_k$ is coefficient of kinetic friction and ${\mu }_S$ is coefficient of static friction, ${\mu }_k<{\mu }_s$

The coefficient of static friction is larger because you have apply greater force to movie because the body initially is in rest- intuitively its harder to start moving an object which is in rest rather than an object already in motion.