Force and Motion Mid Unit Review

Three chairs were rolling across a flat office floor. The blue and red chairs are the same mass, and they have more mass than the yellow chair. Each chair was hit by another chair, but not from the same direction. Use the information in the diagram to answer. Which chair(s) experienced the strongest force when hit? How do you know?

• The blue and red chairs experienced the strongest force because they are both more massive than the yellow chair and they changed speed by the same amount.

• The red chair experienced the strongest force because it is as massive as the blue chair and has the highest ending speed.

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

• The blue chair experienced the strongest force because it takes more force to slow an object than it takes to make it go faster.

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• It will move 2 Newtons to the LEFT

• It will not move because it's balanced

• It will move 2 Newtons to the Right

• It will move 38 Newtons to the Left

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After hockey practice, Carissa and Keenan were playing a game where they were pushing some objects to get them to crash. They were using a cone and two different pucks—a black one with more mass for Crash 1 and a blue one with less mass for Crash 2. They want to know what happened to the cone.

Use the information from the diagram to answer.

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

• There was no force on the cone. In both crashes, only the hockey puck experienced a force.

  
  

  
  

• The diagram doesn’t tell you anything about the force on the cone. It only gives information about the force on the pucks.
  

• It was the same force in both crashes; the hockey puck changed speed by the same amount in each crash, so the force on the cone was the same each time.
  

• Crash 1; the force on the black hockey puck was stronger in this crash, so the force on the cone was also stronger.

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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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Miniature golf is a game in which players hit a golf ball with a club, which causes the ball to roll along the flat ground. Three golf balls with the same mass were rolling on the ground. Each ball was hit by a golf club, but not from the same direction. All the golf balls changed speed as a result of being hit. Use the information in the diagram to answer.

Which golf ball(s) experienced the strongest force when hit? How do you know?

• 
  The white and purple golf balls because they gained force, while the green golf ball lost force.

• The green golf ball because it takes a stronger force to slow something down than to speed something up.

• The green golf ball because it changed speed the most.

• 
  The white golf ball because it has the fastest ending speed.

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NGSS.MS-PS2-1

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Three toy boats with the same mass were in a lake. Two boats were moving and one was stopped. Each boat got bumped by another boat, but not in the same direction. All the boats changed speed as a result of being bumped. Use the information in the diagram to answer.

Which toy boat(s) experienced the strongest force when it was bumped? How do you know?

Responses

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• The blue toy boat experienced the strongest force because it takes a stronger force to slow something down than it takes to speed something up.

• The gray toy boat experienced the strongest force because it had the fastest ending speed.

• The orange and gray toy boats experienced the strongest forces because they both gained the same force as they sped up. The blue boat lost force, so it slowed down.

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

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In order for an object to slow down, force must be applied in what direction?

• Same Direction

• Opposite Direction

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What are the inputs for photosynthesis?

• Carbon dioxide, water and sunlight

• Glucose and oxygen

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What are the outputs for photosynthesis?

• Carbon dioxide, water and sunlight

  
  

  
  

• Glucose and oxygen

  
  

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