Unit 3: Magnetic Fields Review

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

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

• The trains will not move because the magnets are not touching

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

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

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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?

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

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

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

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

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Explain the energy transformations that take place when the gymnast is jumping and bouncing on the trampoline.

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

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

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

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

• In both sets, the magnets will attract.

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Using evidence from the diagram, explain why the launch speed of the spacecraft is greater on Tuesday than on Monday.

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

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

• The speed decreases as the kinetic energy decreases.

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

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

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What is an electromagnet? How does it work?

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

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

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

• The magnetic force changes kinetic energy into potential energy.

• The magnetic force changes potential energy into kinetic energy.

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Two ways that an electromagnet is different from a magnet is it can be ___________ on and off. You can also ___________ the poles.

(a)  

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?

• Moving Car 1 one space toward the center magnet.

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

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

• 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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