Electric, Magnetic, and Gravitational Forces

Which of the following most closely resembles an electromagnet?

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

In an electromagnet, coils of wire are wrapped around a magnetic object to generate a magnetic field. What the is relationship between number of coils and the strength of the magnetic field?

• The more coils an electromagntic has, the stronger the magnetic field

• The more coils an electromagntic has, the weaker the magnetic field

• The larger the metal object, the stronger the magnetic field is

• There is no relationship between number of coils and the strength of a magnetic field

To decrease the strength of a magnetic field around an electromagnet, we must

• increase the number of coils

• increase the size of the iron core

• decrease the size of the iron core

• decrease the number of coils

Tags

NGSS.MS-PS2-5

A negative charge and a positive charge will ________.

• Attract

• Repel

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NGSS.MS-PS2-3

When two magnets are pushed away from one another they ______.

• Attract

• Pole

• Repel

• Compass

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NGSS.MS-PS2-3

Will these two magnets attract or repel?

• Attract

• Repel

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

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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NGSS.MS-PS2-1

NGSS.MS-PS2-5

How could I increase the strength of my electromagnet?

• Smaller battery

• Smaller paper clips

• More loops of copper wire

• Larger Nail

Which of the following forces is responsible for keeping planets in orbit around the sun?

• Electric force

• Magnetic force

• Gravitational force

• Nuclear force

Tags

NGSS.MS-ESS1-1

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

What happens to the gravitational force between two objects if the distance between them is doubled?

• It becomes four times stronger

• It becomes half as strong

• It becomes one-fourth as strong

• It remains the same