State whether the work done in the following case is positive or negative.
Work done by a man in lifting a heavy box to the third floor of a building by means of a rope tied to the box.

Open in App

Solution

If force and displacement work in the same direction then the work carried out on the object is positive, and if they are in opposite direction then the work carried out on the object is positive is negative.
When a man lifts the box by means of a rope from the ground floor to the third floor then the force and the displacement are in the same direction.
Here, the work done is on the box.
Hence, the work done by the man is positive.

Suggest Corrections

Similar questions

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.

State whether work is done or not by writing yes or no, in the following cases:

(a) A man pushes a wall.

(b) A coolie stands with a box on his head for 15 min.

Q. Statement (A): Work done by a man in lifting a bucket out of well, by means of a rope tied to the bucket, is positive.
Statement (B): In the above case, work done by the gravitational force is negative.

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.

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

Join BYJU'S Learning Program

State whether the work done in the following case is positive or negative.Work done by a man in lifting a heavy box to the third floor of a building by means of a rope tied to the box.

State whether the work done in the following case is positive or negative.
Work done by a man in lifting a heavy box to the third floor of a building by means of a rope tied to the box.