Introduction
What Is Energy?
The universe is made up of matter and energy. Matter — anything that has mass and takes up space — is pretty straightforward and easy to grasp, but energy is a bit more abstract.
In physics, energy is the ability to do work, or the ability to move or elicit (cause) change in matter. In effect, the amount of energy something has refers to its capacity to cause things to happen.
Energy has a few important properties. For one, energy is always "conserved" — it cannot be created or destroyed. It can, however, be transferred between objects or systems by the interactions of forces. For example, the energy in vegetables is transferred to the people who digest them.
ENERGY is the ability to cause changes in matter and involves either motion or position (the ability to do work),