Forces at a Distance

Match the following

• repulsion

• a region around a magnetic material or a moving electric charge within which the force of magnetism acts

• magnetic field

• when two opposite magnetic poles are close and pull toward each other

• electromagnet

• the region where the external magnetic field is the strongest at each end of a magnet; north and south

• attraction

• when two of the same poles are close and push away from each other

• magnetic pole

• a core of magnetic material (such as iron) surrounded by a coil of wire through which an electric current is passed to magnetize the core

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When Mr. Smith placed two button magnets together as shown, he observed that the magnets became 'stuck' to each other. What does this show?

• Like poles of the button magnets repel

• Like poles of the button magnets attract

• Unlike poles of the button magnets repel

• Unlike poles of the button magnets attract

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The Earth is like one big giant magnet. Therefore where would the strongest magnetic force be found on

Earth?

• At the poles

• At the equator

• In the water

• The magnetic field is the same at all locations of Earth

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NGSS.MS-PS2-5

The farther apart two objects are, the ____ their gravitational force.

• weaker

• stronger

• more equal

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Magnets can pull on things without touching them.

• True

• False

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The magnetic field is...

• The invisible space around a magnet that pushes or pulls

• The invisible space around a magnet that does nothing

• The visible space around a magnet that does nothing

• The visible space around a magnet that pushes or pulls

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If you want to increase the strength of magnetic forces, which could you do? (Check off all that apply)

• Add more magnets

• Use bigger magnets

• Use stronger magnets

• Decrease the distance between the magnet and the object

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NGSS.MS-PS2-3

Which of the following causes the compass needle to move when brought near electrical current?

• gravitational field

• copper wire

• battery

• magnetic field

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How is Earth's magnetic field similar to that of a magnet?

• It's shaped like a horseshoe.

• It has north and south poles.

• It is made plastic.

• It is hundreds of miles long.

Why will the compass needle move? Select all that apply.

• Because electric current is flowing through the wire

• Because a magnetic field is being produced

• Because the wire is hot

• Because the current is creating thermal energy