JEE Main Physics question

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

(A)Total kinetic energy is conserved
(B)The angular momentum of the sphere about the point of contact with the plane is conservedCorrect
(C)Only the rotational kinetic energy about the centre of mass is conserved
(D)Angular momentum about the centre of mass is conserved

Answer: (B)

Solution

Friction, the only horizontal external force, acts at the contact point and so produces no torque about that

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Question ID VK-159094