Gravity
Magnets
Electromagnets
More Magnets
Potpourri
100
Heat and gravity did this to Earth
What is shape the Earth
100
Objects with iron in them
What do magnets attract?
100
Increase the electric current or increase the number of coils
How can you increase the strength of an electromagnet?
100
You will always have a north and south pole
What happens if you cut a bar magnet in half?
100
Equal to the number of protons
What is the atomic number equal to?
200
Increasing mass or decreasing the distance between two objects
How can gravitational forces be increased?
200
The area around a magnet where the magnetic force is applied
What is the magnetic field?
200
A magnetic field is produced when this happens
What is produced when an electric current is run through a wire?
200
Sprinkling iron fillings showed these
How can magnetic fields become visible to us?
200
A negative charge, responsible for magnetism and electricity
What is an electron?
300
It takes the Earth 24 hours to do this
How long is Earth's period of revolution?
300
Dropping magnets or heating magnets
How can permanent magnets lose their attraction?
300
A coiled wire and an electric current
What is a solenoid made of?
300
They both have a north and south pole, and the field lines curve in toward the poles
How are a bar magnet and the Earth's magnetic field similar?
300
A lodestone is also this
What is another name for a magnet?
400
All planets take an elliptical path
What is the shape of planetary orbits?
400
Two poles, opposite poles attract, and like poles repel
What are three properties of magnets?
400
As soon as the electricity is turned off the magnet stops
When does an electromagnet not work?
400
The electrons all spin in the same direction
What is a domain?
400
The sun's gravity does this for all the planets
What holds the planets in their orbits?
500
Decrease mass or move the two objects far apart
How can gravitational forces be decreased?
500
By stroking an iron object with a permanent magnet
How can you make a temporary magnet?
500
A coiled wire, an iron core, and an electric current
What is an electromagnet made of?
500
At the poles, where the lines are the close together
Where are the magnetic fields the strongest?
500
Iron, nickel, and cobalt
What are three metals that can be made into magnets?
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