nature of work done when work done by gravitational force on a bucket when lifted up

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Solution

Dear Student,

Work done by gravitational force is negative. In this case, the direction of force (vertically downward) and displacement (vertically upward) are opposite to each other. Hence, the sign of work done is negative.

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Work done by gravitational force on a man, in lifting a bucket out of the well by rope tied to the bucket is

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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