During the pure rolling of a rigid uniform body down a fixed rough inclined plane, the work done str

Question

During the pure rolling of a rigid uniform body down a fixed rough inclined plane, the work done strictly by the force of static friction is

Professor PC Thomas Classes · Answer

(d) : In pure rolling motion, the instantaneous velocity of the point of the body in direct contact with the surface is strictly zero. Because there is no relative displacement of the point of application of the static frictional force, the mechanical work done by static friction is mathematically and physically zero. It merely provides the necessary torque to convert translational kinetic energy into rotational kinetic energy without dissipating any overall mechanical energy.