What Is Energy?

What is energy?

1. Scientists define energy as the ability to do work.

2. Energy is the ability to cause change; it does things for us.

What is energy?

1. Energy makes things move. For example: It moves cars along the road and boats over the water.

What is energy?

2. Energy makes things warm up. For example: It bakes a cake in the oven and keeps ice frozen in the freezer.

What is energy?

3. Energy lights our homes! 4. Energy makes technology work (runs electrical devices!)

What is energy?

5. Energy makes things grow!

Two Types of Energy

Kinetic energy Potential energy

Energy of motion

Motion that is actually happening right now Waves moving

Electrons moving

Ball falling

You jumping.

Stored energy

Energy that hasn’t happened YET Bungee jumper before

the jump

Someone holding a ball above the ground.

A car is moving

Acorn in a Tree

Standing

on top of a

mountain

You running a race

A ball falling

The higher the object

the more potential energy

The faster the object

the more kinetic energy

Forms of Energy Kinetic Energy:

1. Electrical

2. Radiant (light)

3. Thermal (heat)

4. Mechanical

5. Sound

Potential Energy:

6. Nuclear

7. Chemical

8. Gravitational

Type of Kinetic Energy

Electrical Energy

Energy an electric current carries

How does electricity work?

Electrons gain enough energy to move

Electricity moving in a wire or lightning

When a light is off we do not

consider it kinetic energy? Why?

Type of Kinetic Energy

Radiant Energy (Light)

Energy carried by traveling electromagnetic/transverse waves

Radio waves Microwaves Infrared Visible Light Ultraviolet X-rays Gamma rays.

Solar energy is an example of radiant energy.

Type of Kinetic Energy

Thermal Energy (Heat)

The sum of kinetic and potential energy of the particles in an object

What is heat? particles moving cells moving atoms moving

Example: geothermal energy

Type of Kinetic Energy

Sound Energy

•Vibrations produce sound waves

•Longitudinal

•Compression

•Energy transferred through a medium

Type of Kinetic Energy

Mechanical Energy

All the potential and kinetic energy in a system of objects

Movement

Examples: Mouse moving it’s

arms

When the mouse trap snaps.

What type of energy is a mousetrap

that has been set but not gone off?

Potential Energy

Chemical

Energy stored in the bonds of atoms and molecules

Energy that holds these particles together.

Examples: Biomass Petroleum Natural gas Propane a Anything you burn

for energy

Why are bonds potential energy?

Type of Potential Energy

Nuclear Energy

Energy holding nuclei together

How do we get this energy: Fission: splitting nuclei

Fusion: combining nuclei

Type of Potential Energy

Gravitational Energy

Energy of position or place

Object has the POTENTIAL to have energy Large rock on top of a

hill

You holding a ball over your head

Hydropower (dams)