Question

A cylinder of mass $m$ is rotated about its axis by an angular velocity $\omega$ and lowered gently on an inclined plane as shown in figure. Then:
Diagram

• A. It will start going upward
• B. It will first go upward and then downward
• C. It will go downward just after it is lowered
• D. It can never go upward

Answer 1

The correct option is D It can never go upward

Since $mg\sin \theta =\mu mg\cos \theta$
so, net force along the incline is zero, so cylinder will remain in position till it stops rotating. After that it will start moving downwards.