Energy

​All forms of energy can be described in two general types of energy, kinetic energy and potential energy.

​​Energy is the ability to do work. The unit for work is Joules (J)

Kinetic energy increases as mass increases.

Kinetic energy increases as speed increases.

energy stored in moving objects

Examples:

Wind Race car Soaring ball

Energy stored in temperature (how hot or cool something is)

A hot object is one whose atoms and molecules are excited and show rapid movement.

 A cooler object's molecules and atoms will show less movement.

​a type of kinetic energy caused by moving electric charges.

​Examples:

• Batteries (direct current)

• Electrical appliances (toasters, vacuum cleaners, lamps, refrigerators, blenders, computers)

• Cellphones

​Energy carried by light rays

Without light energy, there would be no life on Earth. Energy from the sun warms the earth keeping the temperature suitable for life.

Ways we use light energy:

• Plants use light energy from the sun for photosynthesis

• X-Rays

Ways we use sound energy

• sound energy vibrate the bones in our ear allowing us to hear

• sound energy allows us to use ultrasounds.

• Instruments produce sound energy

stored energy that depends upon the relative position of various parts of a system.

​Examples:

1. Rollercoaster at the top of a hill

2. Water at the top of a waterfall

Examples:

• Stretched rubber band

• compressed spring

​Examples:

• Food - energy in food allows us to function

• Batteries

• Dynamite

​9. Nuclear Energy

energy is stored in the nucleus of atoms.

This energy is released when the nuclei are combined (fusion) or split apart (fission).

EX: Nuclear power plants split the nuclei of uranium atoms to produce electricity.