First slide
Friction as component of Net Contact Force

A block of mass 10 kg is in contact against the inner wall of a hollow cylindrical drum of radius 1 m. The coefficient of friction between the block and the inner wall of the cylinder is 0.1 . The minimum angular velocity needed for the cylinder to keep the block stationary when the cylinder is vertical and rotating about its axis, will be g=10 m/s2


 To keep the block stationary,   Frictional force  Weight  μNMg  Here, N=2r r=1 m,μ=0.1  For minimum ω,μMω2r=Mg ω=gμr=100.1×1=10rads-1

Get Instant Solutions
When in doubt download our app. Now available Google Play Store- Doubts App
Download Now
Doubts App