Multiple-Choice Questions

The letters N and S show the magnetic poles.

1. Ramon puts two magnetic toy trains very close to each other on a track. What will happen next, and why?

a  The trains will move closer to each other because the magnetic force will pull the trains together.

b  The trains will not move because the magnets are not touching.

c  The trains will move away from each other because the magnetic force will push the trains apart.

d  The trains will move away from each other because the magnets are not touching.

Name: ___________________________ Date: _________________Magnetic Fields End-of-Unit Assessment

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The letters N and S show the magnetic poles.

2. In a computer simulation, Jeffrey moves a magnet (Magnet 2) toward another magnet (Magnet 1) that cannot move. What happens to the potential energy in the system of magnets?

a  The potential energy does not change because the magnets in the system do not change.

b  The potential energy increases because Magnet 2 moves against the magnetic force.

c  The potential energy decreases because Magnet 2 moves against the magnetic force.

d  The potential energy decreases because Magnet 2 moves in the same direction as the magnetic force.

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The letters N and S show the magnetic poles.

3. Cherise sets identical magnetic carts on two tracks. At the end of each track is a large magnet that cannot move. Cherise can move the carts one space to the left or one space to the right. Which movement will result in the largest increase in potential energy?

a  Moving the cart on Track 1 one space to the right (�).

b  Moving the cart on Track 2 one space to the left (�).

c  Moving the cart on Track 2 one space to the right (�).

d  All these movements will result in the same change in potential energy because they each move a cart the same distance.

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4. Based on the magnetic field line diagrams, what will happen next with these two sets of magnets?

a  The magnets in Set 1 will repel, and the magnets in Set 2 will attract.

b  The magnets in Set 1 will attract, and the magnets in Set 2 will repel.

c  The magnets in Set 1 will not move, and the magnets in Set 2 will attract.

d  In both sets, the magnets will attract.

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The letters N and S show the magnetic poles.

5. Eli is holding two magnets close to each other. What will happen when he lets go?

a  The magnets will not move because the magnets are not touching.

b  The magnets will move closer to each other because the magnetic force will pull the magnets together.

c  The magnets will move away from each other because the magnets are not touching.

d  The magnets will move away from each other because the magnetic force will push the magnets apart.

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The letters N and S show the magnetic poles.

6. Abdul moves a magnetic toy train away from a magnet that cannot move. What happens to the potential energy in the system of magnets during the movement?

a  The potential energy decreases because the train moves in the same direction as the magnetic force.

b  The potential energy decreases because the train moves against the magnetic force.

c  The potential energy increases because the train moves against the magnetic force.

d  The potential energy does not change because the magnets in the system do not change.

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The letters N and S show the magnetic poles.

7. An engineer is investigating potential energy with two identical magnetic roller coaster cars on different sides of a center magnet that cannot move. To test her ideas, the engineer will move one car one space. Which movement will result in the largest increase in potential energy?

a  Moving Car 1 one space toward the center magnet.

b  Moving Car 2 one space away from the center magnet.

c  Moving Car 2 one space toward the center magnet.

d  All these movements will result in the same change in potential energy because they each move a roller coaster car the same distance.

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8. A spaceship is traveling through space. Suddenly, its speed increases. What can you say about the kinetic energy of the spaceship?

a  The kinetic energy increases as its speed increases.

b  The kinetic energy decreases as it is converted into speed.

c  The kinetic energy remains the same because speed and kinetic energy are not related.

d  There is no way to know what happens to the kinetic energy.

9. What happens to the energy in a system of magnets when the magnetic force causes two magnets to move?

a  The potential energy in the system increases.

b  The kinetic energy in the system decreases.

c  Some kinetic energy changes into potential energy.

d  Some potential energy changes into kinetic energy.

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The letters N and S show the magnetic poles.

10. Julia puts two magnetic toy trains very close to each other on a track. What will happen next, and why?

a  The trains will move closer to each other because the magnetic force will pull the trains together.

b  The trains will move away from each other because the magnetic force will push the trains apart.

c  The trains will move away from each other because the magnets are not touching.

d  The trains will not move because the magnets are not touching.

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The letters N and S show the magnetic poles.

11. In a computer simulation, Juan moves a magnet (Magnet 1) closer to another magnet (Magnet 2) that cannot move. Which statement accurately describes the change in potential energy?

a  The potential energy does not change because the magnets in the system do not change.

b  The potential energy increases because Magnet 1 moves against the magnetic force.

c  The potential energy decreases because Magnet 1 moves against the magnetic force.

d  The potential energy decreases because Magnet 1 moves in the same direction as the magnetic force.

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The letters N and S show the magnetic poles.

12. Lin sets identical magnetic carts on two tracks. At the end of each track is a large magnet that cannot move. Lin can move the carts one space to the left or one space to the right. Which movement will increase the potential energy in the system the most?

a  Moving the cart on Track 2 one space to the right (�).

b  Moving the cart on Track 2 one space to the left (�).

c  Moving the cart on Track 1 one space to the right (�).

d  All these movements will result in the same change in potential energy because they each move a magnetic cart the same distance.

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13. Based on the magnetic field line diagrams, what will happen next with these sets of magnets?

a  The magnets in Set 1 will attract, and the magnets in Set 2 will repel.

b  The magnets in Set 1 will attract, and the magnets in Set 2 will not move.

c  The magnets in Set 1 will repel, and the magnets in Set 2 will attract.

d  In both sets, the magnets will attract.

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The letters N and S show the magnetic poles.

14. Sharona puts two magnetic toy vehicles very close to each other. What will happen next, and why?

a  The toy vehicles will not move because the magnets are not touching.

b  The toy vehicles will move closer to each other because the magnetic force will pull the vehicles together.

c  The toy vehicles will move away from each other because the magnets are not touching.

d  The toy vehicles will move away from each other because the magnetic force will push the toy vehicles apart.

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The letters N and S show the magnetic poles.

15. Trevor moves a magnetic toy train away from a magnet that cannot move. What happens to the potential energy in the system of magnets during the movement?

a  The potential energy decreases because the train moves in the same direction as the magnetic force.

b  The potential energy decreases because the train moves against the magnetic force.

c  The potential energy increases because the train moves against the magnetic force.

d  The potential energy does not change because the magnets in the system do not change.

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The letters N and S show the magnetic poles.

16. An engineer is experimenting with two identical magnetic roller coaster cars on different sides of a center magnet that cannot move. The engineer is planning to move one car one space. Which movement will result in the largest increase in potential energy?

a  Moving Car 1 one space toward the center magnet.

b  Moving Car 1 one space away from the center magnet.

c  Moving Car 2 one space away from the center magnet.

d   All these movements will result in the same change in potential energy because they each move a roller coaster car the same distance.

17. A spaceship is traveling through space. Suddenly, its kinetic energy decreases. What is most likely to be true about the speed of the spaceship?

a  The speed increases as the kinetic energy is converted into speed.

b  The speed decreases as the kinetic energy decreases.

c  The speed remains the same because speed and kinetic energy are not related.

d  The speed increases to make up for the decrease in kinetic energy.

18. How does magnetic force affect the energy in a system of magnets when the magnets are released and begin to move?

a  The magnetic force increases the potential energy in the system.

b  The magnetic force decreases the kinetic energy in the system.

c  The magnetic force changes kinetic energy into potential energy.

d  The magnetic force changes potential energy into kinetic energy.

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Written-Response Question #1

The letters N and S show the magnetic poles.

Shanika is an engineer at an amusement park who is experimenting with changes to the setup for a magnetic roller coaster ride. In one ride, there are two identical roller coaster cars (Car 1 and Car 2) that start on opposite sides of a large magnet located at the center of a station. Shanika wants to get the largest increase in potential energy she can by moving one car one space to the left or the right.

Shanika can move Car 1 to point A or point B, or she can move Car 2 to point C or point D. Which movement should she make? Why will that movement result in the largest increase in potential energy? Describe the magnetic force that will act on the roller coaster car she moves.

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Written-Response Question #2

The letters N and S show the magnetic poles.

Lucia is playing with magnetic toy vehicles. She has two identical toy vehicles (Car 1 and Car 2) that start on opposite sides of a center magnet that cannot move. She moves both vehicles one space closer to the center magnet.

How did the potential energy of the two vehicles change? Did the potential energy of one vehicle change more than the other? Why do you think so?

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