Ch. 18: Forms of Energy

1
Ch. 18 Forms of Energy

• Vocabulary
• energy, mechanical energy, light, heat, sound,
  vibrate, chemical energy, electrical energy,
  energy transformation

2
What is Energy?

• Energy is the ability to do work or cause change.
• Work means moving an object from one place to
  another place.
• Energy is different from matter.
• Matter is made of atoms, energy is not made of
  atoms.
• Energy does not take up space, or have mass.
• Energy makes things happen.
• Energy comes in many forms.

3
Mechanical Energy

• Mechanical energy is the energy of moving
  objects.
• Anything that moves is using mechanical energy.

4
Light Energy

• Light is energy we can see.
• It moves from place to place in waves.
• It comes in many colors.
• All the colors of light put together make white
  light.

5
Heat Energy

• Heat energy makes things feel warm.
• Most things that give off light, also give off
  heat.
• Heat energy moves from objects with more heat to
  objects with less heat.
• There is no such thing as cold energy.
• You feel cold when you touch matter that does not
  have much heat in it.
• The more cold something feels, the less heat it
  has in it.

6
Sound Energy

• Guitar Strings Vibrate When Plucked
• Plucked Guitar Strings Make Sound Travel in
  Waves Different Sounds Look Like Different
  Types of Waves

• Sound is energy we can hear.
• Sound is made by vibrations.
• Vibrations are caused by objects moving back and
  forth.
• When someone plucks a guitar string, it makes the
  string vibrate.
• The vibrating string makes the air around it
  vibrate.
• The vibration in the air moves until it comes
  into contact with the air in your ear, which
  begins to vibrate.
• The vibrating air in your ear makes small parts
  in your ear vibrate, which passes through nerves
  to your brain.

7
Chemical Energy

• Energy that can be stored is chemical energy.
• Fuels, like oil, coal, and natural gas are
  chemical energy.
• Chemical energy can also be found in batteries.
• Chemical energy can also be found in food.

8
Electrical Energy

• Electrical energy is the energy of moving
  electric charges.
• Electricity moves from the power plant through
  wires into your home.
• Just about everything we own is powered by
  electricity in some way.
• Also, lightning is made of electricity.

9
Energy Transformations

• One form of energy can be changed into another
  form of energy.
• When energy changes it transforms into another
  form of energy.
• This is how we are able to use energy.
• The chemical energy in batteries is transformed
  into electrical energy when you put them in a
  flashlight, then transformed again into light
  energy when it comes out of the bulb.

10
Questions About Chapter 18

1. What is energy?
2. What are the six different kinds of energy?
3. Which type of energy is produced by vibrations?
4. Which type of energy can be stored to use later?
5. Give an example of mechanical energy.