What is the sign of work done(1) By a man lifting a bucket out of a well by means of a rope tied to the bucket.(2) Gravitational force in the above case.

Open in App

Solution

(1) Positive
In the given case, force and displacement are in the same direction. Hence, the sign of work done is positive. In this case, the work is done on the bucket.
(2) Negative
In the given case, the direction of force (vertically downward) and displacement (vertically upward) are opposite to each other. Hence, the sign of work done is negative.

Suggest Corrections

Similar questions

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.

m

\frac{g}{4}

d

Join BYJU'S Learning Program