What is Energy ????
Answers
Energy is a physical quantity which comes into play when work is being done by one body on another by displacing it, changing its configuration etc. Under similar conditions, the amount of energy spent is proportional to work done. Energy obeys the conservation law that it cannot be created or destroyed but only changed into its different forms. Some different types of energy are Heat Energy, Kinetic Energy, Sound Energy.
For example, while playing a game of billiards if a player hits a stationary ball with the cue stick the mechanical energy provided by him/her converts into kinetic energy as the ball now moves a certain velocity.
The capacity of a body to do work is called the energy of the body . It is the physical quantity.
unit of energy = joules
1kJ = 1000J
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