Electric, Magnetic, and Gravitational Forces

What forces works by combining electric and magnetic forces?

• Electric

• Magnet

• gravitational

• Electromagnetism

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

Scientists suggest that the movement of Earth’s liquid iron core results in electrical currents. These currents would then result in Earth’s magnetic field. Recent satellite data suggest that the strength of Earth’s magnetic field has weakened by about 3.5 percent in some areas. In other areas, Earth’s magnetic field strength has increased by about 2 percent. Which statement best explains the differences in Earth’s magnetic field strength based on the movement of Earth’s liquid iron core?

• The movement of Earth's liquid iron core stopped in both locations

• The movement of Earth's liquid iron core changes direction in some locations

• The movement of Earth's liquid iron core is the same in all locations

• The movement of Earth's liquid iron core increased in speed in both locations

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NGSS.HS-ESS2-3

NGSS.HS-PS2-5

Which of these forces works only by combining electric and magnetic forces?

• Magnetic

• Electric

• Electromagnetism

In a magnet the opposite poles will ---

• Repel

• Attract

Tags

NGSS.MS-PS2-5

When electrons flow through wires from a -terminal to a + terminal a/an --- is created.

• magnet

• static charge

• current

• electromagnet

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NGSS.HS-PS2-5

What kind of energy can cause your hair to stand on end after you brush it vigorously?

• heat energy

• static electricity

• magnetism

• light energy

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Jori was making microwave popcorn and watching it pop. Her grandmother told her not to stand in front of the microwave because it was dangerous. Since Jori had been studying electromagnetic fields in science, she was interested to find out if microwaves really are dangerous. The World Health Organization article, “Electromagnetic fields and public health” states that microwaves cannot emit more than 50 watts of energy per square meter at a distance of 5 cm from the outside of the microwave oven. Electromagnetic fields & public health: Microwave ovens. How can Jori investigate the relationship between the distance from the microwave and the strength of the electromagnetic field (EMF) when she makes popcorn?

• Jori can hold an EMF meter at different distances from the microwave while she is making popcorn and take measurements.

• Jori can use an EMF meter at 5 cm away from different microwaves while they are being used.

• Jori can hold an EMF meter only at the distance she usually stands from the microwave and take measurements while making popcorn.

• Jori can put an EMF meter inside the microwave after she pops the popcorn to take measurements.

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which image is an example of an electromagnet?

• A

• B

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NGSS.MS-PS2-3

Which image represents a magnetic field around a bar magnet?

• A

• B

• C

• D

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

What two things could a person do to increase the strength of an electromagnet?

• decrease the loops

• increase the loops

• decrease current by taking away batteries

• increase current by adding batteries

Tags

NGSS.MS-PS2-3