CH 18- Force Study Guide

A push or pull that causes change in motion

• friction

• force

• lever

• gravity

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A force that opposes motion

• friction

• fulcrum

• simple machine

• balanced

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The force of attraction that Earth exerts on an object

• force

• lever

• friction

• gravity

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A wheel with a groove for a rope

• lever

• pulley

• force

• fulcrum

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A bar that makes it easier to move things

• lever

• pulley

• fulcrum

• gravity

A ramp or sloping surface

• lever

• fulcrum

• inclined plane

• pulley

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A device made only of a few parts that makes work easier

• friction

• simple machine

• force

• balance

The balance point on a lever

• fulcrum

• friction

• lever

• pulley

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What is the purpose of a simple machine?

• to reduce work

• to increase friction

• to make work easier

• to increase buoyancy

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In which of these situations is work done?

• pushing against a brick wall

• throwing a football 20 yards

• holding a book in your hands

• thinking of an essay topic