Force and Motion EOU Review #2

What is the force that causes objects to fall to Earth?

• Air resistance
• Gravity
• Water resistance
• Pressure

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What is the name of the units that we measure force in?

• Einsteins 
• Newtons
• Kg
• Metres

What will cause an object to move?

• Applied forces
• Balanced forces
• Unbalanced forces

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NGSS.MS-PS2-2

If an object is stationary (not moving) the forces acting upon it are _____________

• unbalanced
• weak
• balanced
• Hulk Smash!

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Mateo and Jackie were on a playground rolling some different-sized balls to get them to crash. They used a tennis ball (the same mass) in both crashes. They tried two soccer balls—a pink one (more mass) for Crash 1 and a blue one (less mass) for Crash 2. Mateo and Jackie want to know what happened to the tennis ball. Use information from the diagram to answer.

In which crash did the tennis ball experience a stronger force? How do you know?

• Crash 1; the force on the soccer ball was stronger in this crash, so the force on the tennis ball was also stronger.

• There was no force on the tennis ball. In each crash only the soccer ball experienced a force.

• It was the same in both crashes. The soccer ball changed speed by the same amount in each crash, so the force on the tennis ball was the same both times.

• The diagram doesn’t tell you anything about the force on the tennis ball. It only gives information about the force on the soccer balls.

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Officials are looking into three different ski accidents. The accidents happened when three skiers (all with the same mass) were skiing across flat, snowy ground. They were each bumped by another skier, but not all from the same direction. These skiers changed speed as a result of being bumped. Use the information in the diagram to answer.

Which skier(s) experienced the strongest force when bumped? How do you know?

• The skiers in the yellow and purple sweaters; they both gained the same force as they sped up, but the skier in the red sweater lost force and slowed down.

• The skier in the yellow sweater experienced the strongest force because he has the fastest ending speed.

• All three skiers experienced the same strength force because they changed speed by the same amount.

• The skier in the red sweater because it takes a stronger force to slow something down than to speed it up.

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Which one is balanced?

• top
• bottom
• both

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What is it?

• Pull

• Friction

• Push

• Heavy

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What is the net force?

• 20 N 
• 0 N 
• 400 N 
• 40 N 

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NGSS.MS-PS2-2

A ____________ is a push or a pull on an object.

• friction

• force

• magnet

• gravity

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NGSS.MS-PS2-1

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