Magnetic Fields Summative Test

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.

Place the sets of magnets in order of LEAST to MOST potential energy

(all magnets are held in place)

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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.

Draw magnetic field lines on this set of magnets that show if they will attract, repel, or attract and repel at the same time

An engineer is investigating potential energy with two identical magnetic roller coaster cars on different sides of a center magnet that cannot move.

Which movement will result in the largest increase in potential energy?

• Moving Car 1 one space toward the center magnet.

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

• Moving Car 2 one space toward 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.

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

• The potential energy in the system increases.

• The kinetic energy in the system decreases.

• Some kinetic energy changes into potential energy.

• Some potential energy changes into kinetic energy.

Fill in the levels of energy to show how much Potential Energy (PE) and how much Kinetic Energy (KE) the two magnets have before and after they start to move

Phillip wants to use repelling magnets to launch his skateboard across his driveway.

What are some things Phillip can do to make his skateboard launcher go as fast as possible?