Science Unit 5 Chapter 2 Magnetic Fields

A roller coaster car moves on a roller coaster track through positions W, X, Y, and Z. At what position will the roller coaster car most likely have the greatest kinetic energy?

• W

• X

• Y

• Z

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What happens to the kinetic energy and gravitational potential energy of a ball during free fall?

• Gravitational potential energy and kinetic energy both increase.

• Gravitational potential energy and kinetic energy both decrease.

• Gravitational potential energy decreases, and kinetic energy increases.

• Gravitational potential energy increases, and kinetic energy decreases.

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A student placed a magnet near a pile of paper clips, and she watched as the paper clips were attracted to the magnet. Which statement best compares the potential energy of the paper clips that have reached the magnet to their potential energy when they were farther away?

• A) They have less potential energy, because they have less ability to gain additional kinetic energy.

• B) They have the same amount of potential energy, because they moved at constant speed.

• C) They have the same amount of potential energy, because their height above the ground did not change.

• D) They have more potential energy, because the magnet pulls on them with a stronger force.

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In a physics experiment, a student slides a magnet (Magnet A) towards another stationary magnet (Magnet B) with like poles facing each other. What happens to the potential energy of the system?

• The potential energy remains constant because the magnets are not changing their orientation.

• The potential energy increases because Magnet A is moving towards Magnet B.

• The potential energy decreases because Magnet A is moving towards Magnet B.

• The potential energy increases because Magnet A is moving away from Magnet B.

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Consider a skateboarder using a half-pipe structure for performing tricks. The diagram below shows four marked positions. At which position will the skateboarder have the least kinetic energy just before moving?

• A) A

• B) B

• C) C

• D) D

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The letters N and S show the magnetic poles. 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 increased 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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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 is not related.

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

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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 increased the potential energy in the system.

• The magnetic force decreased 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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The letters N and S show the magnetic poles. Casey pulls a magnetic toy car away from a stationary magnet. What happens to the potential energy in the system of magnets during the movement?

• A) The potential energy increases because the car moves against the magnetic force.

• B) The potential energy decreases because the car moves against the magnetic force.

• C) The potential energy decreases because the car moves in the same direction as 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. In a computer simulation, Noni moves a magnet (Magnet 1) away from another magnet (Magnet 2) that cannot move. Which statement accurately describes the change in potential energy?

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

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

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

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

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