Unit 8: Forces and Motion

Thomas lies down on his bed. Why doesn't he fall on the floor?

• Gravity holds him up.

• The bed holds him up.

• The bed does not have gravity.

Look at the picture. Which force is moving the wagon?

• friction

• a pull

• a push

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Which force do you use to throw a ball?

• friction

• gravity

• a push

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Armando throws a ball with a lot of force. Sam throws a ball with a little force. What will happen?

• Armando's ball will move more slowly than Sam' ball.

• Sam's ball with move more slowly than Armando's ball.

• Both balls will travel at the same speed.

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Look at the pictures. Which object may a magnet attract?

• 
• 
• 

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Two magnets move toward each other. What is happening?

• Opposite magnetic poles are attracting each other.

• Gravity is moving the magnets.

• The same magnetic poles are attracting each other.

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Look at the picture. Which claim is supported by the evidence in the picture?

• The paper clips and safety pins are attracted to a magnet.

• The paper clips and safety pins are repelled by a magnet.

• The magnet attracts the safety pins, but repels the paper clips.

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You blow softly on a ball. The ball crosses a finish line in 8 seconds. You blow hard on the ball. The ball crosses the finish line in 3 seconds.

What happened when you uses less force to move the ball?

• The ball did not move.

• The ball moved faster than when you blew hard.

• The ball moved more slowly than when you blew hard.

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You give a toy car a hard push. You give the same toy car a gentle push. How do you know the car will go faster with the hard push?

• A greater force causes less change in motion.

• A greater force causes greater change in motion.

• A greater force causes no change in motion.

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Look at the picture. Which claim is best supported by evidence in the picture?

• Magnets can attract objects without touching them.

• Magnets repel paper clips.

• Magnets must touch objects to attract them.

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