Question

A block of mass m is kept on the edge of a horizontal turn table of radius R, which is rotating with constant angular velocity $\omega$ (along with the block) about its axis. If coefficient of friction is $\mu$, find the friction force between block and table.

• A. $m{\omega }^{2}R$
• B. $m\omega R$
• C. $m\omega R^2$
• D. $\frac{m{\omega }^{2}R}{2}$

Answer 1

The correct option is A $m{\omega }^{2}R$

Here centripetal force is provided by friction force.
Friction force = centripetal force $=m{\omega }^{2}R$