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, (c) Work done by friction on a body sliding down an inclined plane, (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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Dharmendra Kumar
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