Show:
Magnetism
Electromagnetism
Uses for Electromagnetism
Gravity
Forces in Nature Potpourri
100
Every magnet has two of these points that have opposite magnetic qualities
Poles
100
The magnetic field of an electromagnet can be turned off by doing this
Removing the current
100
This device converts electrical energy into mechanical energy
Electric motor
100
These are the two factors that affect the amount of gravitational force between any two objects
Mass and distance
100
Mass is measured in these units, by using a triple beam balance
Grams
200
Opposite poles ___________ each other, and like poles ___________ each other.
Opposite poles ATTRACT each other, and like poles REPEL each other
200
The direction of the magnetic field of an electromagnet can be reversed by doing this
Reversing the electric current
200
This device converts mechanical energy into electrical energy
Electric generator
200
Increasing mass does this to gravitational force
Increases it
200
Weight is measured in these units, by using a spring scale
Newtons
300
This is the region around all magnets, in which magnetic forces can act
Magnetic field
300
The strength of an electromagnet can be increased in these three ways
Adding more coils of wire, increasing the electrical current, using a better ferromagnetic core (Answer can also include using DC instead of AC current, and using thicker wire)
300
How can electricity be created using a magnet and a wire coil?
Move the magnet through the wire coil
300
Increasing distance does this to gravitational force
Decreases it
300
These balance between these two factors causes the planets to have steady orbits around the Sun
Gravity, and speed (or inertia)
400
These are the groups of atoms that need to be aligned for an object to be magnetic
Domains
400
This is the name for a coil of wire with an electric current running through it, which produces a magnetic field
Solenoid
400
This is a device that measures electric current, using a small electromagnet on a pivot between the poles of a permanent magnet.
Galvanometer
400
This is the measure of gravitational force on an object
Weight.
400
What are two ways that the magnetic fields of the Earth, a bar magnet, and an electromagnet are similar?
Can be any two of the following: They have north and south poles They have similar shapes The fields have direction The fields are strongest at the poles
500
These are the three elements that magnets attract
Iron, cobalt, and nickel
500
This is the process that causes an electric current in a changing magnetic field.
Electromagnetic induction
500
This kind of train uses electromagnetism to cause the train to float above the track, allowing the train to move at very high speeds with very little friction
Maglev train
500
What is meant by the statement "Mass is universal, weight is not universal?"
An object would have the same mass no matter where it is in the universe, but it would weigh different amounts on different planets.
500
Scientists believe that the Earth's magnetic field is created by this
Moving charged particles in the Earth's core