Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.

Is it possible that a force is acting on a body but still work done is zero? Explain giving one example.

A boy thrown a rubber ball vertically upwards. What type of work positive or negative, is done :

(a) By the force applied by the boy?

(b) By the gravitational force of earth?

How does the kinetic energy of a moving body depend on its (i) speed and, (ii) mass?

Give one example each in which a force does:

(a) Positive work

(b) Negative work, and

(c) Zero work.