Electrical and Magnetic Forces

Static electricity is the buildup of charges between two objects. What best explains why a balloon is attracted to hair when the two have been rubbed together?

• The balloon and hair both have positive charges

• The balloon and the hair both have negative charges

• The balloon and the hair both have neutral charges

• The balloon and the hair both have opposite charges

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Two bar magnets are held close together. They are released and allowed to move freely. The bar magnets quickly come together. Which best explains why this happens?

• The poles facing one another are both south poles

• The poles facing one another are both north poles

• The poles facing one another are opposite poles

• One magnet was bigger than the other

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NGSS.MS-PS2-5

Frederick sets paper clips out on a table. He then takes a magnet, places it directly beneath the paper clips under the table, and moves the magnet. He finds that the paper clips move with the magnet. Why does this happen?

• Magnetic force is a repellant force

• Magnetic forces act on wood, like in the table

• The paper clips are feeling the gravitational force of the magnet

• Magnetic forces act at a distance, even betwewn objects

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Surrounding each magnetic is an invisible force field called

• Gravity

• A magnetic field

• An electric field

• The Force

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What is the cause of electricity?

• Magnetism

• Gravity

• Moving electrons

• Lightning

When electrons in magnetic domains all spin in the same direction, they create an invisible force known as_______

• Electricity

• Magnetism

• Static Electricity

• Electromagnet

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Two magnets pull on each other. What can make the magnets pull with LESS force?

• Add heat to one magnet.

• Use two stronger magnets.

• Turn both magnets around.

• Move magnets farther apart.

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Students attach magnets to toy race cars. They want one car to push another car without touching it. How can the students arrange two cars so they will push each other without touching.

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Which object demonstrates the way a magnet is used?

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A directional flow of electric charge

• Magnitude

• Attraction

• Repulsive

• Current

• Charged object