1. Unit 3P
Nature's Energies

2. 1. What is Energy

3. Imagine . . . You’ve been swimming for a long time
Friends ask you to play volleyball

4. You say you don’t have the energy
What exactly do you mean?
What is energy?

5. Vocabulary
Energy
The ability to do work

6. Moving things is a type of work
When you hit a volleyball
You move it!

7. Playing volleyball, jumping, and running all take
When you jump and run
You move yourself!
Playing volleyball, jumping, and running all take
ENERGY

8. There are several types of energy
1. Mechanical Energy
When something moves
It is using mechanical energy

9. Heat passes from one object to another
2. Heat Energy
Heat passes from one object to another

10. 3. Electric energy
Electric energy is the flow of electrons which makes light bulbs light up and radios play.

11. 4. Chemical energy
When a chemicals are changed into mechanical energy with a chemical reaction

12. The mechanical energy moves the car
A chemical reaction with the gasoline causes a change from chemical energy to mechanical energy
The mechanical energy moves the car

13. Because it does not have mass
Energy is not matter
Matter takes up space
Because it does not have mass
or take up space

14. you can see what energy does
You cannot see energy
but
you can see what energy does
Each kind of energy can change into other kinds of energy

15. All the energy in the world comes from the sun
The sun’s energy is called
Solar Energy

16. On Earth, solar energy is changed into other kinds of energy
Nothing on Earth could live without
energy from the sun

17. Plants could not live without
solar energy
Plants make their own
food

18. Plants make food out of water from the soil and gas in the air called
carbon dioxide (CO2)

19. People eat the food that plants make
Apples, potatoes, lettuce, celery, and beans are all plant foods
that people eat

20. people would not have any
Without solar energy,
people would not have any
plants to eat

21. Some animals also eat plants
Animals eat other animals that
eat plants

22. There would be no animals for
Without plants,
animals could not live
There would be no animals for
people to eat

23. You would not have chicken or hamburgers or fish to eat
You would not have the things that
animals produce, such as
milk, eggs or wool

24. of the sun (solar energy)
People and animals
are warmed by the heat
of the sun (solar energy)

25. When it is cold, people use fuels
such as coal and oil to heat their homes.
These fuels are made by solar energy

26. When the plants and animals died, their bodies became part of the
Coal and oil were formed from plants and animals that lived millions of years ago (chemical energy)
When the plants and animals died,
their bodies became part of the
Earth

27. The energy from these dead plants and animals
became chemical energy
in coal and oil

28. When coal and oil are burned, the stored chemical energy becomes
heat energy