11. 2 Imagine... You’ve been swimming for a long time Friends ask you to play volleyball.
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Transcript of 11. 2 Imagine... You’ve been swimming for a long time Friends ask you to play volleyball.
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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