Force & Motion Mid-Unit Review

How does force strength affect the change of velocity of an object?

• A stronger force causes a smaller change in velocity.

• A stronger force causes a greater change in velocity.

• A weaker force causes a greater change in velocity.

• A weaker force causes no change in velocity.

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When a bumper car carrying a person with more mass collides with a bumper car carrying a person with less mass, what happens?

• The person with less mass will experience a weaker force.

• The person with more mass will move farther after the collision.

• The person with more mass will experience a stronger force.

• The person with less mass will move farther after the collision.

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If the same strength force is exerted on two objects but the objects have different masses, the object with ____ mass will have a greater change in velocity.

• less

• more

• same

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The amount of matter that makes up an object is the ___ of the object.

• velocity

• mass

• speed

• weight

What are the five ways an object's motion can change?

• start, stop, speed up, slow down, hit something

• force, friction, mass, velocity, speed

• start, stop, change direction, speed up, slow down

• none of the above (there are only 4 ways)

The force applied to an object as it moves across a surface is...

• friction

• change in velocity

• slow down

• speed up

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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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Three boats were moving across the surface of a lake. The gray and pink boats are a greater mass than the orange boat. Each boat was bumped by another boat. Which boat experienced the strongest force when hit? How do you know?

• The gray and pink boats because they are more massive, and all boats changed velocity by same amount.

• The pink boat - it's as massive as the gray boat and has the highest ending speed.

• All three - they all changed speed by the same amount.

• The gray boat - it takes more force to slow down an object than it takes to make it go faster.

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In which crash did the puck experience a stronger force?

• The puck didn't experience a force. Only the paddles experienced force.

• Crash 2: The force of the purple paddle was stronger in this crash because it has more mass, so the force on the puck was stronger,

• The diagram doesn't tell you anything about the force on the puck.

• The puck experienced the same force in both crashes.

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In which crash did the test car experience a stronger force?

• Crash 1: Force on garbage truck was stronger, so force on car was also stronger.

• There is NO force on the car. In each crash, only the truck experienced 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 test car. It only tells you about the force on the trucks.

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