Magnetism, Electricity and Gravitational Force Lesson

Joe has an idea to cut a bar magnet in half so that he can have one magnet with a north pole and one magnet with a south pole. What is wrong with this idea?

• It is impossible to cut a magnet in half.
• It is impossible to create an extremely small magnet.
• It is impossible to create a magnet with only one magnetic pole.
• It is impossible to separate two opposite magnetic poles once they are in contact with each other.

Where is the magnetic force the strongest?

• Position A

• Position B

• Position C

• Position D

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Magnetic field lines that curve away from each other show __________.

• Repulsion
• Attraction
• A magnetic domain
• Where the magnetic field is strongest

The force of gravity on the surface of the Moon is about one-sixth the force of gravity on the surface of Earth. Which describes the relationship of mass and weight of an object on the Moon compared to that on Earth?

• Both mass and weight are greater on the Moon.
• Both mass and weight are less on the Moon.
• Mass is the same, but weight is less on the Moon.
• Weight is the same, but mass is less on the Moon.

A soft metal core that becomes magnetic when an electric current  passes through coils around the core

• Magnet
• Electromagnet
• Electricity
• Copper Wire

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Which statement is true about magnetic forces?

• Distance does not affect the strength of the force field
• The charge of the magnet affects the strength of the force field.
• There is an east pole and west pole to every magnet
• Distance and the strength of the magnet affect the strength of the force field

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Distance and mass are two factors that affect

• Gravitational Force Fields

• Magnetic Force Fields

• Electric Force Fields

• Electrostatic Force Fields

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What happens when two north poles of a magnet are placed together?

• they repel
• they attract
• they cancel each other out
• the strength of the magnet is doubled

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What option best describes this field?

• An electric field generated by two positive charges. They would attract each other.

• An electric field generated by two negative charge which would attract each other.

• An electric field generated by two opposite charges. They would attract each other.

• There is no force field present.

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Which is a factor that affects the strength of gravitational, magnetic, and electrostatic force fields?

• Mass
• Volume
• Distance
• Density

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