When you are climbing stairs, work done by the weight is positive. (T or F).

Work done by centripetal force is zero . (T or F)

when is the work done by a force negative.

Weight is a scalar quantity. (T or F)

In each of the following a force,F is acting on an object of mass,m. The direction of displacement is from west to east shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative,positive or zero.

A body may have zero weight and a finite mass. (T or F).

The work done by the tension T in t above process is

Work is done only when:

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:- work done by the resistive force of air on a vibrating pendulum in bringing it to rest.

When is mechanical work done?