Unit 8 Forces & Motion

       Which is a push or a pull?

• a force

• friction

• speed

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Look at the picture. Which force is being used to move the bicycle?

• gravity

• a magnet

• a push

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Denise gently taps a golf ball with her club. Maria hits a golf ball with a lot of force. What will happen?

• Maria’s ball will move faster than Denise’s ball.

• Denise’s ball will move faster than Maria’s ball.

• Both balls will travel at the same speed.

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Which force causes a ball to fall to the ground?

• friction

• gravity

• a push

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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. Then you push the same wagon hard. Which way of pushing the wagon will make it 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 wooden 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

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