When a sphere rolls down an inclined plane, then identify the correct statement related to the work done by friction force

The friction force does positive translational work

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The friction force does negative rotational work

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The net work done by friction is zero

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All of the above

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Solution

The correct option is C The net work done by friction is zero
For a body to purely roll down the inclined plane, static friction will act at the contact point and the will not slip on the surface. Hence work done by friction force is zero.

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The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative:

(a) work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket.

(b) work done by gravitational force in the above case,

(d) work done by an applied force on a body moving on a rough horizontal plane with uniform velocity,

(e) work done by the resistive force of air on a vibrating pendulum in bringing it to rest.

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