PA 5⁰1 MA Pully A of the treadmill is driven by a motor that can supply a moment M_A = 200 in.lb. Pully B is frictionless, and its bearing slides in a frictionless slot where force P tensions the belt. Both Pulleys A and B have 1.5 in, radius and the coefficient of static friction between pulley A and the belt is 0.3. Determine the smallest value of P needed to prevent slip between pulley A and the belt.

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A: YOUR   EXPLANATION

System of Forces

A force is an external influence or agent that changes the state of a system. According to Newton's second law, the force applied to a body is proportional to the change in momentum of a body. Hence, whenever a force is applied to a body, its momentum changes. If the body is at rest, under the action of force, its state of rest changes to motion. In other words, the magnitude of the momentum of the body changes from zero to a measurable value. Similarly, if the body possesses some initial velocity, it has some associated momentum, the effect of force can cause the body to halt or come to rest, that is, the momentum reduces to zero.