The friction hook is made from a fixed frame which is shown colored and a cylinder of

Question:

The friction hook is made from a fixed frame which is shown colored and a cylinder of negligible weight. A piece of paper is placed between the smooth wall and the cylinder. Determine the smallest coefficient of static friction μ at all points of contact so that any weight W of paper p can be held.

Given:

θ = 20 deg

FF 0.5 W 0.5 W