Science Chapter 7 Energy in Motion

When using a wheelbarrow, explain how gravity affects you moving the wheelbarrow.

• friction and gravity

• Gravity pulls the wheelbarrow toward the center of the earth.

• gravity

• Friction slows down the motion of the wheelbarrow.

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The force that pulls objects towards the center of the earth is called _____.

• weight

• gravity

• wind

• water

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When a force moves something, then _____ is done.

• work

• friction

• wind

• machine

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What is doing the work in the following example? The watermill ground the corn.

• water

• gravity

• wind

• machine

Riding a bicycle is an example of what kind of energy?

• electrical

• mechanical

• light

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What is doing the work in the following example? The cornstalks blew in the field.

• water

• wind

• people

• machine

3 kinds of invisible forces

• friction, magnetism, and chemical

• gravity, friction, and magnetism

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Simple machines make work _______.

• work

• change

• water

• easier

a force that slows or stops motion

• weight

• motion

• mechanical

• friction

Definition: A push or a pull

• friction

• machine

• force

• magnetism

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