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Copy of GR7 SCI Unit 2 Post Assessment (11/17/2025)

Last updated 22 days ago

10 questions

Instructions

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7th Grade Physics

Question 1

1.

Question 2

2.

The 5,000-kilogram car moving at 20 miles per hour because the car has less mass then the train and can move faster if it wanted to.

Question 3

3.

Question 4

4.

Question 5

5.

Car B had more energy than Car A when it hit because it had a much bigger mass than Car A.

Question 6

6.

Question 7

7.

Use the data of Newton's Cradle and watch the video to answer questions 7 and 8.
VIDEO

Choose the correct claim about what is happening to the Kinetic Energy of the spheres.

Question 8

8.

The temperature of the spheres increases after making contact with another sphere; this shows that some of the kinetic energy transferred to thermal energy.

Question 9

9.

Question 10

10.

 Analyze the graphical display and choose the answer that best describes the relationship between mass and Kinetic Energy.

As mass increases, kinetic energy increases.

Mass and kinetic energy are not related.

The 15,000-kilogram train moving at 20 miles per hour because even though both the train and the car are moving at the same speed, the train has more mass. With its higher mass, the train will have more kinetic energy than the car.

Graph 1

Graph 3

Graph 2

Graph 3

Graph 4

Both cars had the same energy because they were traveling approximately the same speed.

If a middle schooler walks to Dunkin while another middle schooler is playing a video game, which statement about their kinetic energy is correct?

The walking middle schooler has more kinetic energy than the one playing video games.

Kinetic energy does not depend on speed.

The temperature of the spheres remains unchanged; this shows that the kinetic energy keeps increasing.

 Analyze the image below.  Student A believes that the pendulum does not lose energy as it swings, the energy just converts between kinetic and gravitational potential energy.  Student B believes that the pendulum does lose energy as it swings and as energy conversions happen.  Which student is correct? Explain why this student's argument is correct.

Student B is correct because the the energy is changing from gravitational potential energy to kinetic energy and from kinetic energy to gravitational energy as it swings.  However, each full swing is a little lower which means that some energy is being transferred to air molecules.

If a car slows down, what can we say about its kinetic energy?

The kinetic energy is unaffected by speed.

The kinetic energy decreases, indicating that energy is transferred away from the car.