Magnetic Forces Test Review

Rita is about to place her new toy train on the track. The track is magnetic and the bottom of the toy train is magnetic. Based on the diagram, what will happen when Rita lets go of the train and why?

• The train will set down directly on the track because the attracting magnetic force will pull the train and track together.

• The train will set down directly on the track and start moving forward because the magnets will attract to each other and then convert into kinetic energy.

• The train will float above the track because the repelling magnetic force will push the train and track apart.

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

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Analyze the magnetic field lines of the two magnet systems models. What will happen next with these two sets of magnets?

• Magnet System A will repel, and Magnet System B will attract.

• Magnet System B will repel, and Magnet System A will attract.

• In both systems, the magnets will repel.

• In both systems, the magnets will attract.

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James puts two magnetic toy trains very close to each other. What will happen next, and why?

• None of the toy trains will move because the magnets are not touching.

• Train Car #1 will attach to the Train Engine because the magnetic force will pull the two trains together.

• Train Car #2 will attach to the Train Engine because the magnetic force will pull the two trains together.

• Both trains cars will move towards their Train Engine because the potential energy stored in the system of magnets will convert into kinetic energy.

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Jeffrey moves Magnet 2 towards Magnet 1. Magnet 1 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 increases because Magnet 2 moves in the same direction as 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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A cyclist is riding down the road. Suddenly, the cyclist’s speed decreases. What can you say about the kinetic energy of the cyclist?

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

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

• The kinetic energy increases as it is converted into potential energy.

• The kinetic energy decreases as its speed decreases.

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A roller coaster inspector is testing two identical magnetic roller coasters. The launcher magnet at the beginning of the roller coaster track cannot move. During the tests, the inspector will move each cart one space. Which movement should result in the largest increase in the kinetic energy of the cart and why?

• Moving Cart 1 one space toward the launcher magnet; More potential energy is stored in the system as the cart moves against the magnetic field of the launcher magnet, so more potential energy can be converted into kinetic energy.

• Moving Cart 1 one space away from the launcher magnet; More potential energy is stored in the system as the cart moves with the magnetic field of the launcher magnet, so more potential energy can be converted into kinetic energy.

• Moving Cart 2 one space toward the launcher magnet; More potential energy is stored in the system as the cart moves against the magnetic field of the launcher magnet, so more potential energy can be converted into kinetic energy.

• All these movements will result in the same change in potential energy because they each move a roller coaster car the same distance so the same amount of potential energy is being stored in the system.

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Jaycie used a digital simulation to explore energy and magnetism. First she observed the amount of energy in the system when two magnets were close to each other and locked in place. Then she moved the magnets apart and locked them in place. What happened to the potential energy in the system of magnets during Jaycie’s simulation tests?

• The potential energy decreased when the magnets were moved apart.

• The potential energy increased when the magnets were moved apart.

• The potential energy did not change.

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Which answer explains your previous answer?

• The same magnets were used during the test, so potential energy does not change.

• The magnets moved in the same direction as the magnetic force.

• The magnets moved against the magnetic force.

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Two magnets are being held away from each other and then they are released and begin to move toward each other. How does magnetic force affect the energy in this system of magnets?

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

• Moving the darker car one space to the right (→).

• Moving the lighter car one space to the left (←).

• Moving the lighter car one space to the right (→).

• 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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