Introduction Energy

Energy: the ability to cause changes in matter

Energy can be transform, or change,

from one form into another.

Example:

A child kicks a ball.

The child has energy

from food

Ball getsenergy from

foot

Ground and airabsorb energy

from ball

When all energy

is used up the motion

stops

Can anyone think of another example of how

energy can change forms?

In your groups, answer the following question:

Does a ball have energy when it is just sitting on the table? Why or why not?

Yes, because someone gave it energy when they put it on the table.

This is called potential energy.

Potential Energy

The energy of an object that is because of it's condition or position.

Can be thought of as stored energy.

Potential Energy changes to kinetic energy!

Kinetic EnergyThe energy an object has because it is in motion.

- Sound

- Thermal

- Light

- Electrical

- Mechanical

- Chemical

Forms of Energy

Sound EnergyA type of kinetic energy

because air or particles are in motion.

Thermal EnergyThe tiny particles that make up matter are in motion, causing kinetic

energy.

Light EnergyYou can see energy

when light comes off an object and hits your

eyes.

Electrical EnergyEnergy that caused by movement of electrical charges, or electricity.

Mechanical Energy

Potential Energy + Kinetic Energy = Mechanical

Chemical EnergyEnergy that is released

from a chemical reaction.

Law of Conservation of Energy

Energy does not appear or disappear.

It only changes forms.

Energy cannot be created or destroyed. The total amount of

energy is always the same.

Examples: Flashlight: Batteries create chemical energy which causes it to emit light and heat energy.Radio: Uses electrical energy to create sound energy that we can hear.Car Engine: Chemical reactions in the car cause chemical energy which creates mechanical energy that moves the car. Wind Up Toy: Winding up the toy increases potential energy, then displays kinetic mechanical energy when it moves.