4th Grade SCIENCE: Chapter Seven
Terms in this set (50)
The force that pushes magnets apart or pulls them together
A object with magnetic force
Parts of a magnet where the magnetic force is strongest
The area of magnetic force around a magnet
When one magnet enters the magnetic field of another magnet, it is either attracted or __.
A magnet's magnetic field is strongest near the magnet's __.
The magnetic field is weaker farther away from the __.
Much of the inside of Earth is made of melted __, which creates a magnetic field.
Earth spins around its __, an imaginary line through the center of Earth.
Earth has __ magnetic pole near its geographic North Pole.
Earth has __ magnetic pole near its geographic South Pole.
The aurora australis is a display of lights near the __.
Ancient sailors used a __ to navigate the seas when they could not see land or stars.
An instrument that uses Earth's magnetic field to help people find directions.
A compass needle is actually a thin __.
A compass needle points in this direction
All magnets have __ poles.
Like poles repel each other, and unlike poles __ each other.
The region of magnetic force around a magnet
A compass __ is attracted to Earth's magnetic poles, so it can be used to find which way is north.
A coil of wire wrapped around a metal core, such as an iron bar
A device that changes electrical energy into sound
Sounds in a loudspeaker are produced when objects __, or move back and forth quickly.
A __, such as a stereo, sends electric current to an electromagnet in a loudspeaker.
In a loudspeaker, the electromagnet is attached to a __.
The part of a loudspeaker that vibrates to create sound
When a friend calls you on the telephone, their voice is changed into electrical __.
A device that uses a magnet to convert sound into electrical signals
Headphones ar small loudspeakers with tiny __.
An electric current flowing through a wire produces a __ around the wire.
Electromagnets are used in __ to make sound.
A device that changes electrical energy into mechanical energy
A rod that can spin and move
This turns motion into electrical energy
The opposite of a motor, it changes mechanical energy into electrical energy
A simple generator has many of the same parts as a __.
Electrical energy can be generated by spinning a magnet inside a coil of wire. The more loops of wire in the coil, the more __ is produced.
The mechanical energy for a generator is provided by a __.
Oil, coal, and natural gas can be burned to heat water, producing __.
Nuclear power plants split atoms that contain large amounts of __.
Geothermal plants use the heat inside Earth to produce __.
Flowing water can turn turbines and create electrical __.
Wind can be changed into electrical energy using a __.
This flows in one direction and then flows in the opposite direction
Most generators that make electrical energy produce an __.
When the flow of a current is always in one direction, it is called a __.
A battery is an example of a __ current power source.
__ motors convert electrical energy into motion.
Electric __ change the energy of motion into electrical energy.
Alternating current continuously switches direction. __ current always flows in one direction.
YOU MIGHT ALSO LIKE...
MCAT | Mometrix Comprehensive Guide
Physical Science Chapter 7 Magnetism
Magnetism (Middle School)
OTHER SETS BY THIS CREATOR
5TH Grade SCIENCE, Ch. SIX
5TH Grade SCIENCE, Ch. FIVE
5TH Grade SCIENCE, Ch. FOUR
5TH Grade SCIENCE, Ch. THREE
THIS SET IS OFTEN IN FOLDERS WITH...
4th Grade SCIENCE: Chapter Three
4th Grade SCIENCE: Chapter Four
4th Grade SCIENCE: Chapter Five
4th Grade SCIENCE: Chapter Six