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(D) For a sphere moving on a rough horizontal surface,the force of friction acts at the point of contact. Since the friction force acts at the point o

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the angular momentum of the sphere about the point of contact with the plane is conserved

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(D) For a sphere moving on a rough horizontal surface,the force of friction acts at the point of contact. Since the friction force acts at the point of contact,the torque due to friction about the point of contact is zero. According to the principle of conservation of angular momentum,if the net external torque about a point is zero,the angular momentum about that point remains constant. Therefore,the angular momentum of the sphere about the point of contact with the plane is conserved.

$A$ solid homogeneous sphere of mass $M$ and radius $r$ is moving on a rough horizontal surface,partly rolling and partly sliding. During this kind of motion of this sphere,

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