Fields of Force and Potential Energy 2020

Magnets A and B are of equal magnetic strength. In which position will magnets A and B have the least attractive force toward one another.

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

Magnets A and B are of equal magnetic strength. In which position will magnets A and B have the greatest force of repulsion away from one another.

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

The picture shows how to make an electromagnet. Which of the following would make the electromagnet stronger?

• Wrapping the wire around a nonmetallic object

• Using a longer wire from the battery to the nail

• Wrapping the wire around the nail more times

• Making the loops of wire less tightly coiled

A scientist runs an electric current along a wire. A magnetic compass is placed near the wire. The scientist observes that whenever the current is turned on, the compass needle moves. Why does the compass needle move?

• The current creates an electric field around the wire.

• The current creates a magnetic field around the wire.

• The current adds electric charge to the compass needle.

• The current increases the force of gravity on the compass needle

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

A teacher demonstrates a chemical reaction of a hand warmer. Hand warmers are used by people to warm their hands in cold weather. When opened, the iron in the warmer reacts with the air, producing heat and a reddish-brown substance.Select all statements that apply to the hand warmer reaction.

• The reactants and products have equal potential energy.

• The products have more potential energy than the reactants.

• The reactants have more potential energy than the products.

• Heat is released to the surroundings.

• Heat is absorbed from the surroundings

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NGSS.MS-PS1-2

NGSS.MS-PS1-4

The diagram below shows a boulder rolling down a hill into a valley and then up the opposite hill. At which position does the boulder have the least gravitational potential energy?

• A

• B

• C

• D

Tags

NGSS.MS-PS3-2

Students examine a spring (A)at rest, and then hang different masses from the spring (B & C). How much elastic potential energy does Spring A have compared to the others?

• Zero Elastic Potential Energy

• More Elastic Potential Energy than both B and C

• More Elastic Potential Energy than B and less than C

• Less Elastic Potential Energy than both B and C, but it does have some elastic potential energy.

Tags

NGSS.MS-PS3-2

Students examine a spring (A)at rest, and then hang different masses from the spring (B & C). How much elastic potential energy does Spring B have compared to the others?

• Zero Elastic Potential Energy

• More Elastic Potential Energy than both A and C

• More Elastic Potential Energy than A and less than C

• Less Elastic Potential Energy than both A and C, but it does have some elastic potential energy.

Tags

NGSS.MS-PS3-2

Students examine a spring (A)at rest, and then hang different masses from the spring (B & C). How much elastic potential energy does Spring C have compared to the others?

• Zero Elastic Potential Energy

• More Elastic Potential Energy than both A and B

• More Elastic Potential Energy than A and less than B

• Less Elastic Potential Energy than both A and B, but it does have some elastic potential energy.

Tags

NGSS.MS-PS3-2

One bar magnet sits on a table, and a rubber band suspends another magnet above it. In the view on the left, the upper magnet is held in place and cannot move. In the view on the right, the upper magnet has been released. How did the potential energy change when the upper magnet was released?

• Magnetic, elastic and gravitational potential energy increased.

• Magnetic, elastic and gravitational potential energy decreased.

• Magnetic and elastic potential energy increased, and gravitational potential energy decreased.

• Magnetic and gravitational potential energy decreased, and elastic potential energy increased.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS3-2