Energy Energy is defined as the ability to

Energy? • Energy is defined as the ability to do work.

Change • How is energy changed?

Energy Transfer Any time a change takes place, energy is transferred from one form or object to another. ALL THINGS HAVE ENERGY! Heat energy is given off when energy is transformed from one form to another.

The Law of Conservation of Mass & Energy is never created or destroyed. The only thing that changes is the form in which the energy appears. Various forms of energy are transformed, allowing living and nonliving systems to interact and operate.

Two Categories of Energy Potential Energy Kinetic Energy • Stored energy or energy of position. • Energy of motion

Forms of Energy Chemical Nuclear Elastic Gravitational Radiant (solar) Thermal Mechanical Sound Electrical

Chemical Energy stored on chemical bonds. Metabolism Lighting a candle

Nuclear Energy stored in the nucleus of an atom

Elastic Energy • Energy that is stored in an object by applying a force. • Ex. Stretching a rubber band

Gravitational Energy • Stored energy of position, the higher up an object is the more potential energy it has. • Ex. Rock on a cliff, or water behind a dam

Radiant (Solar) Energy carried by light When light strikes something, it can be absorbed, reflected, or transmitted.

Thermal Energy All objects have thermal heat Thermal heat increases as temperature increases. Comes from chemical energy

Mechanical Energy (Motion) Kinetic Energy= motion Potential Energy= stored (position)

Sound Energy • Movement of energy through object or substances in waves • Ex. Hearing thunder or listening to the radio.

Electrical Energy carried by an electric current An electric device uses the electrical energy provided by a current flowing in the device.