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FM: EOU (10/22) Version B

Last updated almost 3 years ago

6 questions

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Question 1

1.

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.

Question 2

2.

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.

Question 3

3.

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. Use the information in the diagram to answer.

Question 4

4.

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

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

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

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

Question 5

5.

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?

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

The block ran out of force.

The floor absorbs force from the block.

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

Question 6

6.

In a warehouse, the workers sometimes slide boxes along the floor to move them. Two boxes were sliding toward each other and crashed. The crash caused both boxes to change speed. Based on the information in the diagram, which statement is correct? In your answer, explain what the forces were like and why the boxes changed speed.
Box 1 has more mass than Box 2.
Box 1 and Box 2 are the same mass.
Box 1 has less mass than Box 2.

CFS:
accurately identifies the changes to each object in a collision
accurately describes the relationship between friction, mass and velocity in a collision

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

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.