Force and Motion Review #1

Some office chairs were rolled across a flat floor. All three chairs have the same mass. Each of the chairs is given a push, but not all from the same direction. Each chair changed speed as a result of being pushed. Use the information in the diagram to pick the best answer.

• The black chair experienced the strongest force because it takes a stronger force to slow something down than it takes to speed something up.

• The blue chair experienced the strongest force because it had the fastest ending speed.

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

• The pink and blue chairs experienced the strongest forces because they both gained the same force as they sped up. The black chair lost force, so it slowed down.

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Based on the information shown in the diagram, which chair experienced a force in the opposite direction of the other two chairs?

• The blue chair

• The black chair

• The pink chair

• None. All chairs experience a force in the same direction.

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Select all of the following that describe a change in velocity:

• speeding up

• slowing down

• changing direction

• start moving

• stop moving

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A force is NOT required to change the velocity of an object.

• True

• False

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How an object changes velocity depends on the direction of the force exerted on that object.

• True

• False

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A stronger force can cause a greater change in velocity.

• True

• False

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At practice one day, three soccer balls that have the same mass were rolling across a flat field. They were each kicked by a soccer player, but not from the same direction. Each soccer ball changed speed as a result of being kicked.

Using the diagram, which soccer ball(s) experienced the strongest force when it was kicked? How do you know?

• The purple soccer ball because it has the fastest ending speed.

• The blue soccer ball because it takes a stronger force to slow something down than to speed something up.The , blue soccer ball, because it takes a stronger force to slow something down than to speed something up.

• The blue soccer ball because it changed speed the most.

• The purple and yellow soccer balls because they gained force, while the blue soccer ball lost force.

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At practice one day, three soccer balls that have the same mass were rolling across a flat field. They were each kicked by a soccer player, but not from the same direction.

Using the diagram, which soccer ball(s) experienced a force in the opposite direction it was moving?

• The purple ball

• The yellow ball

• The blue ball

• The purple and yellow balls

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Engineers are designing a new car and they need to test their ideas by modeling crashes with different types of trucks. They are using a more massive garbage truck for Crash 1 and a less massive pickup truck for Crash 2. The green test car has the same mass in both crashes. Use information from the diagram to answer.

In which crash can we infer the green test car experience a stronger force? How do you know?

• Crash 1; the force on the garbage truck was stronger in this crash, so the force on the green test car was also stronger.

• There is no force on the green car. In each crash, only the truck experienced a force.

• It was the same from both crashes. The trucks changed speed by the same amount in both crashes, so the force on the test car was the same both times.

• The diagram doesn’t tell you anything about the force on the green test car. It only gives information about the force on the trucks.

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Engineers are designing a new car and they need to test their ideas by modeling crashes with different types of trucks. They are using a more massive garbage truck for Crash 1 and a less massive pickup truck for Crash 2. The green test car has the same mass in both crashes. Use information from the diagram to answer.

What can we infer about the velocity of the green test car after the test crash?

• In crash 1, the green car experiences a greater change in velocity.

• In crash 2, the green car experiences a greater change in velocity.

• It was the same after both crashes.

• The diagram doesn’t tell us enough information to infer about the green cars change in velocity after the test crash.

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