Unit 8: Forces and Motions 2/3/4

You claim that lessening a force on a ball will lessen its speed. What evidence supports this claim?

• The ball moved faster when you blew softly.

• The ball moved more slowly when you blew softly.

• The ball moved at the same speed no matter how softly you blew.

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What claim can you make about how force affects the speed of an object?

• When the force on an object increases, its speed increases.

• When the force on an object increases, its speed decreases.

• When the force on an object increases, its speed stays the same.

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What can you do to make a swing go higher?

• push it more gently

• push it harder

• stop pushing

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You push a wagon gently. The you push the same wagon hard. Which way of pushing will make the wagon move more quickly?

• Pushing hard and pushing gently will move the wagon at the same speed.

• Pushing hard moves the wagon more quickly.

• Pushing gently moves the wagon more quickly.

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Which object does a magnet attract?

• a sheet of paper

• a steel paper clip

• a wood pencil

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Which kinds of objects does a magnet attract?

• objects made from paper or plastic

• objects made from rubber or cloth

• objects made from steel or iron

Look at the picture. Why do these magnets repel each other?

• All magnets repel each other.

• The same poles are facing each other.

• Different poles are facing each other.

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What happens if you put the same poles of two magnets together?

• Nothing happens.

• The magnets attract each other.

• The magnets repel each other.

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Which claim is supported by evidence in this picture?

• The magnet attracts the safety pins and paper clips.

• The magnet attracts the safety pins but not the paper clips.

• The magnet attracts the paper clips but not the safety pins.

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Which is true?

• A magnet must touch an object to attract it.

• A magnet does not have to touch an object to attract it.

• A magnet must touch an object to repel it.

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