When a sphere rolls down an inclined plane, then identify the correct statement related to the work done by friction force.
(A) The friction force does positive translational work.
(B) The friction force does positive rotational work.
(C) The net work done by friction is zero.
(D) All of the above

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Solution

Dear Student ,
In fact a sphere rolling down an inclined plane has two motions. (1). The linear motion of the centre of mass of the sphere.(2).Rotational motion about the centre .Thus the net work done by the friction is zero .

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