S8P5A

Which of the following best describes a magnetic field?

• a measure of the length of the magnet

• an invisible region that surrounds the north pole of a magnet

• an invisible region that surrounds the north pole of a magnet

• a region around a magnet in which you can measure magnetic forces

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

The students continued their experiments on force fields, this time investigating magnetism. One group student set up the demonstration you see here. “Oh wow!” Sarah exclaimed. “It’s magic!” Is it magic? Which statement best explains how the center magnet is able to hover between two other magnets?

• the magnets are stacked so that like poles are facing one another

• the opposite poles of each magnet are facing each other so they repel

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

• the middle magnet is attracted to the top magnet but pulled down by gravity

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Jason places a bar magnet on a flat surface and covers it with a sheet of paper. Then he evenly sprinkles a layer of iron filings on top of the paper. Which of the following diagrams indicates the most likely arrangement of the filings on the paper?

• Figure A

• Figure B

• Figure C

• Figure D

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NGSS.MS-PS2-5

Candice learns that all magnets have two magnetic poles. Which of the following observations would best support this statement?

• When a bar magnet is cut in half, each half has a north pole and a south pole.

• the north pole of a compass needle is attracted to the south pole of a bar magnet

• when an electric current flows through a wire, a magnetic field forms around the wire

• the strength of a horseshoe magnet’s magnetic field decreases as the magnet is pulled away from another object

What happens to the magnetic field around a wire when the electric current through the wire increases?

• It decreases

• It remains the same

• It increases

• It reverses direction

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NGSS.MS-PS2-3

What is the term for the rate at which energy is transferred or converted?

• Power

• Energy

• Work

• Force

What is the unit of resistance in an electrical circuit?

• Volt

• Ampere

• Ohm

• Watt

What is the principle of energy transfer in a battery-operated device?

• Mechanical to electrical

• Electrical to mechanical

• Chemical to electrical

• Electrical to chemical

Tags

NGSS.HS-PS3-3

Which of the following is a longitudinal wave?

• Light wave

• Sound wave

• Water wave

• Radio wave

Using the image below, where is the magnetic field of this magnet the strongest?

• Position A

• Position B

• Position C

• Position D

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5