HOW DOES FORCE AFFECT MOTION

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

• a. True

• b. False

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

• a. True

• b. False

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When the force of two objects that is involved in a collision has the same strength, the velocity of teach object will be different, if the objects have different _____.

• a. weights

• b. masses

• c. speed

• d. directions

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When two objects collide, the force that is exerted on each object are in _______ directions and they have the ______ strength.

• a. different; same

• b. same, opposite

• c. opposite; same

• d. same; different

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NGSS.MS-PS2-1

Scott and James work at a grocery store. After the grocery store closed, they were playing a game with a shopping cart and Scott’s skateboard. They crashed the skateboard and the shopping cart two times. The shopping cart had more mass in Crash 2 than it did in Crash 1.

In which crash did the skateboard experience a stronger force? Why?

• a. The skateboard did not experience a force; only the shopping cart experienced a force in the crashes

• b. Crash 2; the force on the cart was stronger in this crash, so the force on the skateboard was also stronger

• c. The diagram doesn’t tell you anything about the force on the skateboard. It only gives information about the force on the shopping cart.

• d. The skateboard experienced the same force in both crashes. The shopping cart changed speed by the same amount in each crash, so the force on the skateboard was the same each time.

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NGSS.MS-PS2-2

Sandra pushed a wooden block and it slid across the floor. The wooden block gradually slowed down and stopped after moving 10 meters.

Why did the block stop moving?

• a. The floor exerted a force that is opposite to the direction of the block’s motion

• b. The block ran out of force

• c. The floor absorbs force from the block

• d. All objects stop moving because their natural state is to be still

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NGSS.3-PS2-1

. 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.

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

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

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

• c. 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.

• d. 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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NGSS.MS-PS2-2

At dinner, Hans passed the salt shaker to his sister Jessica by sliding it across the wooden table. The salt shaker gradually slowed down and stopped after moving 12 centimeters.

Why did the salt shaker stop moving?

• a. The salt shaker ran out of force.

• b. The table exerts a force that is opposite to the salt shaker’s motion

• c. The table absorbs force from the salt shaker

• d. All objects stop moving because their natural state is to be still

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NGSS.3-PS2-1

NGSS.3-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.

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

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

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

• c. 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.

• d. 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

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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.

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

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

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

• c. 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.

• d. 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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NGSS.MS-PS2-1

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