The figure shows a system with a block m1 attached to a simple square thread screw with a mean diameter of 10 mm, a pitch of 3 mm and whose coefficient of static friction on the thread is 0.35. Block...

The figure shows a system with a block m1 attached to a simple square thread screw with a mean diameter of 10 mm, a pitch of 3 mm and whose coefficient of static friction on the thread is 0.35. Block m1 is attached to block m2 by a rope, each of blocks m1 and m2 have a mass of 4 kg.
Block m2 is in turn attached to a 15-kg block W by another rope, which passes over a static drum where the coefficient of static friction is 0.20. Determine the required Moment M that must be applied to the screw to start lifting block W. The coefficient of static friction between the surface and blocks m1 and m2 is 0.25.

Need free body diagrams

Extracted text: m1 В m2 M W