Non-Contact Forces/Electromagnetism

When two magnets repel, they ________________

• change color
• pull together
• push apart
• get colder

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NGSS.3-PS2-3

Iron filings and bar magnets are placed on a piece of paper. Explain the pattern on the diagram below. Where is the magnetic field the strongest?

• The magnetic field is only strong at the north pole

• The magnetic field is only strong at the south pole

• The magnetic field is strongest at the magnet’s poles.

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How can you increase the strength of this electromagnet?

• Get a larger nail.

• Add more loops of wire.

• decrease the loops of wire.

• Get a smaller nail.

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NGSS.MS-PS2-3

What types of charges attract?

• Positive and Positive
• Positive and Neutral
• Negative and Neutral
• Positive and Negative

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NGSS.3-PS2-3

Electric charges that are alike _______ each other.

• Attract
• Repel

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If more loops of wire are added to this electromagnet, what will happen?

• It will pick up 10 pins instead of 5.

• Nothing it will pick up the same amount of pins.

• It will pick up 2 pins instead of 5.

• It will be overloaded and pick up nothing.

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What is one advantage of the electromagnet pictured below

• The magnet can be turned off when the electric current is switched off
• The magnet is permanent so it is more reliable
• The magnet is turned off when the domains align
• It would be more of an advantage if the magnet was permanent

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What causes an object to become magnetic?

• scientists do not know why an object is magnetic but they can determine which materials are likely to become magnetic
• An object is magnetic based on its number of north and south poles
• The atoms within a magnet align in the same direction creating a magnetic domain
• it is simply based on the element of the object

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The image shows a generator.  How does it work?

• The generator is plugged in to create light in a power outage.
• The electricity attracts magnetism to produce light.
• The generator uses electricity to create mechanical energy.
• The generator converts mechanical energy into electricity.

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NGSS.MS-PS2-3

The picture shows a simple motor created by a student.  The motor works because________.

• The magnet on the bottom produces an electric current for the wires.
• The electric current flows through the conductors on the left and right sides, creating a magnetic field around the object on top. 
• The object is able to convert mechanical energy into electrical energy.

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