Force and Motion 22

If an object is slowed down, which direction was a force exerted on it?

• in the same direction of its motion

• in the opposite direction of its motion

Tags

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In order to get an object to speed up, a force must be exerted in the _______ direction as the motion of the object.

• same

• opposite

• any

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.

Tags

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NGSS.MS-PS2-1

What does "exert" mean?

• to reach a conclusion about data

• the same in quantity, size, or value

• to apply a force

• to push or pull

Tags

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What is required to change the velocity of an object?

• friction

• an arrow

• a tail line

• a force

Tags

NGSS.MS-PS2-2

Scientists created models that show a rocky asteroid crashing into a moon (less mass) and a planet (more mass). In both crashes, the asteroid was the same mass. Scientists want to know what happened to the asteroid. Use the information in the diagram to answer.

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

• Crash 2; the force on the planet was stronger in this crash, so the force on the asteroid was also stronger.

• There was no force on the asteroid. Only the moon and planet experienced a force in each crash.

• The diagram doesn’t tell you anything about the force on the asteroid. It only gives information about the force on the planet and the moon.

• The force was the same in both crashes. The planet and moon changed speed by the same amount so that means the force on the asteroid was the same in both crashes.

Tags

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What is true about a collision between a less massive pod and the more massive Earth?

• the pod exerts a stronger force on the Earth

• the pod exerts an equal force on the Earth

• the pod exerts a weaker force on the Earth

• the Earth will experience a greater change in velocity after the collision

Tags

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Mass is the amount of _________ in an object

• space

• energy

• velocity

• matter

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?

• 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.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

How is mass related to kinetic energy? (example: wrecking ball vs. a yo-yo)

• as mass increases, kinetic energy decreases

• as mass increases, kinetic energy increases

• there is no relationship between mass and kinetic energy

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