Simple Definition:
* Energy is the ability to do work. Work, in this scientific sense, means causing a change in an object's position or state.
More Complex Definition:
* Energy is a fundamental property of nature that allows for the performance of work or the generation of heat. This definition emphasizes that energy isn't just something we *do*, it's a fundamental property of the universe itself.
Key Concepts:
* Energy is conserved: It cannot be created or destroyed, only transformed from one form to another (Law of Conservation of Energy).
* Energy has many forms: These include kinetic energy (motion), potential energy (stored energy), thermal energy (heat), chemical energy (stored in chemical bonds), electrical energy, nuclear energy, and more.
* Energy can be measured: We use units like joules (J) or calories (cal) to quantify energy.
Examples of energy in action:
* A moving car has kinetic energy.
* A stretched rubber band stores potential energy.
* A burning candle releases chemical energy as heat and light.
The definition of energy is fundamental to understanding how the universe works. It explains everything from the movement of planets to the workings of our bodies.
