The sign of work done by a force on a body is important to understand the following quality

The sign of work done by a force on a body is important to understand the following quality a 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.m (b) Work done by gravitational force in the above case.
(c) Work done by friction on a body sliding down on inclined plane.
(d) Work done by an applied force on a body moving on rough horizontal plane with uniform velocity.
(e) Work done by resistive force of Air on A vibrating pendulum in bringing it to the rest.

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