Question

Work done by a coolie on the luggage on his head while carrying it on a horizontal road.

Answer 1

Work:

1. When the force applied to an object cause the displacement then the work is said to be done.
2. It can be positive, negative, or zero.
3. When the displacement of the object is in the direction of the force then the work done is positive.
4. When the displacement of the object is opposite to the direction of the force then the work done is negative.
5. When the displacement of the object is perpendicular to the direction of the force then the work done is zero.

Work done by a coolie on the luggage on his head while carrying it on a horizontal road.

1. As the direction of the force on the luggage is in the upward direction but the displacement is horizontal.
2. The angle between the displacement and the force is $90°$.
3. The work done on the luggage by the coolie is zero.