A solid homogeneous sphere is moving on a rough horizontal surface, partly rolling and partly sliding. During this kind of motion of the sphere:

Question

A solid homogeneous sphere is moving on a rough horizontal surface, partly rolling and partly rolling and partly sliding. During this kind of motion of the sphere:

(a) Total KE is conserved 

(b) Angular momentum of the sphere about the point of contact with the plane is conserved 

(c) Only the rotational KE about centre of mass is conserved 

(d) Angular momentum about centre of mass is conserved

Answer 1

The correct option is (b).

Explanation:

Angular momentum of the sphere about the point of contact with the plane is conserved.