Comment on the nature of work done in the following situations.
1. Work done by frictional force when a box is pushed along a floor
2. Work done by a person when he pulls up a bucket of water from the well using a rope.
3. A man pushing a stationary truck.

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Solution

1. Work done is negative as friction is opposier to the direction of motion.
2. Positive as the displacement is in the direction of force.
3. Zero as the displacement is zero.

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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.

4.0 m

100 N

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m

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