1. The letters N and S show the magnetic poles. Francisco is holding two magnets close to each other. What will happen when he lets go?

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

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

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

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

2. The letters N and S show the magnetic poles. Cecilia puts two magnetic toy trains very close to each other on a track. What will happen next, and why?

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

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

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

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

3. 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?

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

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

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

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

4. The letters N and S show the magnetic poles. Katrina moves a magnetic toy train toward a magnet that cannot move. What happens to the potential energy in the system of magnets during the move?

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

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

• C. The potential energy decreases because the train 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.

Pablo sets identical magnetic carts on two tracks. At the end of each track is a blue magnet that cannot move. Pablo 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?

• Moving the cart on Track 1 one space to the right (→).

• Moving the cart on Track 1 one space to the left (←).

• Moving the cart on Track 2 one space to the left (←).

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

6. The letters N and S show the magnetic poles. An engineer is investigating potential energy with two identical magnetic roller coaster cars on different sides of a center magnet that cannot move. For the experiment, the engineer will move one car to one space. Which movement will result in the largest increase in potential energy? (C3)

• A. Moving Car 2 one space toward the center magnet.

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

• C. Moving Car 1 one space toward the center magnet.

• D. All these movements will result in the same change in potential energy because they each move a car the same distance.

7. One of the two identical metal spheres is given a negative charge by rubbing a wool cloth on its surface. Next, one sphere is moved so that it touches the other sphere, and then they are separated. Which statement correctly describes the spheres after separation?

• A. Each sphere has a positive charge

• B. Each sphere has a negative charge*

• C. Sphere 1 is neutral, and sphere 2 has a negative charge

• D. Sphere 1 has a positive charge, and sphere 2 has a negative charge

8. Look at the diagram of the bar magnets below. What will happen to the force between the two magnets if they are pulled further apart?

• A. The force would weaker

• B.  The force would be stronger

• C. The force would stay unchanged     

• D.  The force would reverse the poles

9. A balloon has a negative charge. A glass rod has a positive charge. What will happen when the glass rod is brought near the balloon?

• The balloon will be attracted to the rod.

• The balloon will be repelled by the rod

• The balloon will remain in place

• The balloon will spin in circles

10. Iron filings and bar magnets were placed on a sheet of paper. The following diagram shows the pattern made on paper. At which location is the magnetic field the strongest?

• A. 1

• B. 2

• C. 3

• D. 4