EXAMPLE 1: THE WORK-ENERGY RELATION

Calculate the power of the frictional force to do work on the grinding disk and its power to do work on the work piece B. Assume the grinding wheel and connection have a total mass of m. What happens to the difference in the power?

Solution:

(a) Power of friction to do work on the grinding wheel

Kinetics:

Kinematics:

(b) Power of friction to do work on work piece B

The difference in the power between P_A and P_B appears in the form of heat that ends up heating the surfaces.