Magnetism

Ashley made a paper boat and attached paperclips to the edges. In order to control her boat she used a horseshoe magnet. How is Ashley able to control her boat without touching it?

• The boat is moving with currents in the water.

• The boat is attracted to the magnet by the force of gravity.

• The boat is attracted to the magnet by the force of magnetism.

• Ashley would not be able to do this without touching the boat.

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Here is a picture showing how two magnets will stick to one another when opposite poles align. When these magnets are pulled slightly apart, does the attractive force between them still exist?

• Yes, but the new attractive force is due to gravity.

• No, since they are not touching, no force is at work.

• Yes, even though they are not touching, they are pulling on one another.

• No, when the magnets are apart, they exert a repulsive force on one another.

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The center magnet in the picture is hovering between two magnets, making it appear to float.

Which best explains how the center magnet is able to hover between two other magnets?

• The opposite poles of each magnet are facing each other, so they repel.

• The magnets are stacked so that similar poles are facing one another.

• The middle magnet is repelling the top magnet while attracting the bottom.

• The middle magnet is repelling the top magnet while attracting the bottom.

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Choose all of the examples where there would be an increase in the electric or magnetic force.

(Choose 3)

• Increase the amount of charge on each object

• Decrease the distance between the objects

• Decrease the charge on one of the objects

• Increase the mass of the objects

• Increase the mass of the objects

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Jacob floated a long steel sewing needle on a small piece of cork in a glass of water. He noticed that as he turned the glass around, the cork and needle continued to point toward his backyard. Even after he turned the small floating cork around gently, the needle finally pointed toward the backyard.

What is the MOST LIKELY conclusion Jacob will draw?

• There is a large magnet in the backyard.

• Jacob’s backyard is on the north side of his house.

• The backyard is downhill from where Jacob is standing.

• A gentle breeze is causing the needle to point toward the backyard.

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Anna learned that every magnet has a north and a south end called poles. She notices that when she puts the north end of a magnet near the south end of another magnet, they pull together. What can Anna conclude from her observation?

• Opposite poles of magnets repel.

• Opposite poles of magnets attract.

• The north pole picks up iron nails.

• Only the north pole has an attractive force.

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A force is a push or pull on an object that could affect its motion. Which is an example of a non-contact force?

• friction force

• magnetic force

• drag force

• spring force

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Sal and Marie were experimenting with bar magnets in science class, picking up chains of paper clips. Where should they expect the magnetic force the bar magnet to be the strongest and pick up the most paper clips?

• at both Poles

• at the South Pole

• at the North Pole

• in the center of the bar magnet

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You may have seen what a magnet will do to iron filings, arranging them into specific patterns like the one you see here. This arrangement is due to the

• vibration

• force field

• magnetic field

• magnetic impulse

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Jake has four pairs of horseshoe magnets in different sizes. They are all made of the same material and have the same shape. He experiments by moving each pair farther and farther apart. Which pair of magnets will attract each other at the farthest distance?

• the largest pair of magnets

• the smallest pair of magnets

• the third largest pair of magnets

• the magnets all have the same amount of attraction

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