What is Energy? Definition, Meaning & Example
The capacity to do work or cause change in matter.
TL;DR: The capacity to do work or cause change in matter.
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Energy: The capacity to do work or cause change in matter.
Explanation
Energy exists in many forms including kinetic energy (energy of motion), potential energy (stored energy due to position), thermal energy (heat), chemical energy (stored in chemical bonds), electrical energy, and radiant energy (light). Energy can transform from one form to another but cannot be created or destroyed, as stated by the Law of Conservation of Energy. When energy transforms, the total amount remains constant. Understanding energy is fundamental to explaining how machines work, how organisms function, and how the universe operates.
Example
A waterfall demonstrates energy transformation: the falling water has gravitational potential energy which converts to kinetic energy as it falls, then to thermal energy as it hits rocks at the bottom.
Frequently Asked Questions
Can energy be destroyed?
No, energy cannot be created or destroyed; it can only be transformed from one form to another, following the Law of Conservation of Energy.
What is the difference between kinetic and potential energy?
Kinetic energy is energy due to motion, while potential energy is stored energy due to an object's position or state that can be released.
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