An object of mass 10 kg is at a point A on a table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your answer.

A battery lights a bulb. Describe the energy changes involved in the process.

Certain force acting on a 20 kg mass changes its velocity from 5 m s^-1 to 2 m s^-1. Calculate the work done by the force.

The potential energy of a freely falling object decrease progressively. Does this violate the law of conservation of energy? Why?

What are the various energy transformations that occur when you are riding a bicycle?