CSA 8.PS2.3 ESSENTIAL STANDARD

Donna is attempting to make an electromagnet to pick up old nails in and around her driveway. Which of these materials would be best to use for the core in order to make the strongest electromagnet to pick up the most nails?

• water

• iron nail

• wooden stake

• plastic tube

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OK.8.PS2.3

DOK1

Mr. Smith challenged his students to create an electromagnet that will pick up more paper clips than anyone else in the class. Timmy is very excited and begins to collect all of the necessary materials. He finds a D-cell battery, an iron nail, and a large roll of copper wire. What could Timmy do, using just these materials, to increase the strength of his electromagnet to pick up the maximum amount of paper clips?

• cut the iron nail in half to use as the core

• only attach the battery to one end of the nail

• increase the number of coils of copper he puts around the nail

• decrease the number of coils of copper wire he puts around the nail

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OK.8.PS2.3

DOK1

Braddy connected the loose wire to the battery and created an electromagnet. He picked up 45 thumb tacks with his electromagnet, though his goal was to pick up 50 thumb tacks. What could Braddy do to increase the strength of his electromagnet and pick up more thumbtacks?

• Use fewer coils of wire.

• Use a screw instead of a nail.

• Use two batteries instead of one.

• Replace the nail with a piece of steel.

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DOK1

What advantage does this electromagnet have over a permanent magnet?

• The electromagnet is easier to use.

• The electromagnet is less dangerous.

• The electromagnet can be turned off.

• The electromagnet is cheaper to make.

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DOK2

How can the strength of this electromagnet be increased?

• by using a different type of wire

• by adding more coils around the nail

• by making more connections to the battery

• by replacing the current battery with a smaller one

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OK.8.PS2.3

DOK2

Which graph BEST represents the students' data?

• 
• 
• 
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OK.8.PS2.3

DOK3

Which of the following changes would most likely increase the strength of an electromagnet?

• Decreasing the number of turns in the coil around the core

• Reducing the current flowing through the coil

• Using a non-conductive material for the core

• Increasing the density of the core material

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OK.8.PS2.3

DOK2

Two oppositely charged particles are held in place near each other. When the particles are released, they will most likely–

• accelerate away from each other.

• accelerate toward each other.

• rotate in a clockwise direction.

• rotate in a counterclockwise direction.

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DOK2

Static electricity happens when electrons pass from one object to another, such as from your hair to a comb as you comb your hair. If you then hold the comb near your hair, strands of hair appear to move forward and ”stick to the comb.” This is because the hair and the comb –

• attract each other because they have opposite charges.

• attract each other because they have the same charges.

• repel each other because they have opposite charges.

• repel each other because they have the same charges.

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OK.8.PS2.3

DOK3

Some rocks contain small amounts of iron. These rocks have magnetic properties. The iron particles act like tiny magnets that are attracted by the two oppositely charged magnetic poles of Earth.

A student uses a toy that has a wand with a magnet on the tip and iron filings to add “hair” to a face. As the student moves the wand across the plastic cover, the iron filings sprinkled on the face below follow the movement.

Which change in the design of the toy would allow the student to move more iron filings with the wand at one time?

• Use a wand with a more powerful magnet.

• Make the iron filings a different color.

• Make the sheet of plastic thicker.

• Use more iron filings in between the cardboard and plastic.

Tags

OK.8.PS2.3

DOK3