Amplify Science - U1 Ch. 5 Test

What happens to the strength of the magnetic attraction as objects get farther away from each other?

• the strength decreases

• the strength increases

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Hoverboards work by balancing which two forces?

• spring and gravity

• magnetic and buoyant

• gravity and magnetic

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If forces are balanced and then a force is changed, the forces become unbalanced. What will this cause an object to do?

• start moving

• stay steady

• change color

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Some magnets need electricity to work, they can be turned on and off. What are these magnets called?

• gravity

• electromagnets

• force

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An electromagnet is made with...

• clay, sand, and rocks

• coiled wire and a source of electric charge, such as a battery

• cardboard, tape, and yarn

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What object is not made up with electromagnets?

• hairdryer

• doorbell

• speakers

• sneakers

When an electromagnet is turned off, the magnetic force...

• stops and it no longer attracts or repels other objects

• remains the same and continues to attract or repel other objects

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NGSS.MS-PS2-3

If a tractor has an electromagnet being used to lift heavy scrap metal, why would the scrap metal fall?

• the magnet was turned on

• the magnet was turned backwards

• the magnet was turned off

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Ideas about magnetic forces can help people think of new inventions.

• True

• False

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