11. 2 imagine... you’ve been swimming for a long time friends ask you to play volleyball

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2

Imagine . . . You’ve been swimming for a long time

Friends ask you to play volleyball

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You say you don’t have the energy

What exactly do you mean?

What is energy?

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Vocabulary

Energy

The ability to do work

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Moving things is a type of work

When you hit a volleyballYou move it!

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When you jump and runYou move yourself!

Playing volleyball, jumping, and running all take

ENERGY

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There are several types of energy

1. Mechanical Energy

When something moves It is using mechanical

energy

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2. Heat Energy

Heat energy passes heat from one object to another

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3. Electric energy

Electric energy makes light bulbs light up and radios

play.

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4. Chemical energy

Gasoline has chemical energy.

When gasoline is burned in a car’s engine, the chemical

energy is changed to mechanical energy

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The mechanical energy moves the car

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Energyis not matter

Because It does not have mass

ortake up space

Matter takes up space

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You cannot see energybut

you can see what energy does

Each kind of energycan change into other

kinds of energy

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All the energy in the world comes from the sun

The sun’s energy is called

Solar Energy

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On Earth, solar energy is changed

into other kinds of energy

Nothing on Earth could live without

energy from the sun

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Plants could not live withoutsolar energy

Plants make their ownfood

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Plants make food out of water from the soil

and

Gas in the air calledcarbon dioxide (CO2)

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People eat the food thatplants make

Apples, potatoes, lettuce, celery, and beans are all plant foods

that people eat

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Without solar energy,people would not have any

plants to eat

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Some animals also eat plants

Animals eat other animals thateat plants

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Without plants,animals could not live

There would be no animals for people to eat

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You would not havechicken or hamburgers

or fish to eat

You would not have the things that

animals produce,such as milk, eggs or wool

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People and animals are warmed by the heat

of the sun

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When it is cold, people use fuelssuch as coal and oil to heat their

homes.

These fuels are made by solar energy

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Coal and oilwere formed from plants and

animalsthat lived millions of years ago

When the plants and animals died,

their bodies became part of theEarth

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The energy from these dead plants and animals

became chemical energyin coal and oil

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When coal and oil are burned,the stored chemical energy

becomes heat energy