Explain why magnets would repel or attract each other
Repel - same poles (+/+), (-/-)
Attract- unlike poles (+/-) (-/+)
100
Auroras are most visible _______
a. near Earth's north and south magnetic poles.
b. near the Equator
c. in the tropics
d. during the daytime
a. near Earth's north and south magnetic poles
100
Electric motors are not found in a ____________.
a. ceiling fan
b. light bulb
c. power drill
d. refrigerator
b. light bulb
100
What is a fossil fuel?
Natural fuels (ex: coal, oil, natural gas)
100
What is a magnet?
Object that attracts certain metals, mainly iron
200
Why don't magnets attract wooden items?
Wooden objects do not contain iron
200
How does a compass work?
The needle of a magnetic compass is a permanent magnet that points towards the magnetic north pole of the Earth.
200
What is a generator?
A device that uses magnetism to convert energy of motion into electrical energy.
200
What does a hydroelectric power plant use to produce energy?
Water
200
What is the difference between a magnetic field and magnetic pole?
Magnetic field - space in which the force of a magnet can act
Magnetic poles - two areas where the magnet is the greatest
300
Will a paper clip outside a magnet's field be pulled toward the magnet? Why?
No, the magnetic force acts only inside the magnetic field.
300
Why does an aurora occur?
The sun sends out solar wind (particles), they are pulled towards the Earth's magnetic fields. The particles collide with the atmosphere and start to glow.
300
What are some examples of appliances that use electricity part of the time?
Fans, washing machines, dishwashers
300
What are three examples of alternate energy sources?
Hydroelectric power
Wind turbines
Geothermal energy
Solar energy
300
What is the difference between a motor and a generator?
Motor: changes electrical energy to energy of motion
Generator: changes energy of motion to electrical energy
400
What are three different types of magnets?
Horseshoe magnet, bar magnet, ring magnet
400
What are the two types of auroras commonly called?
Northern and Southern lights
400
How can putting a Chromebook in "sleep" or "standby" mode save your family money on the electric bill?
The devices uses less electricity, which results in a small electric bill.
400
What are two ways you can conserve energy?
Don't leave the refrigerator door open
Turn off the lights when you leave the room
Use cold water
Turn off TVS, radios, and stereos when no one is using them
Run a full dishwasher
400
Earth can be considered a/an __________.
a. electromagnet
b. permanent magnet
c. temporary magnet
d. generator
b. permanent magnet
500
Suppose you use a magnetic iron nail to pick up several paper clips. Several hours later, the iron nail will not pick up the paper clips. Why did this happen?
The nail is a temporary magnet.
500
Suppose an astronaut on the moon looks at a compass. The compass does not point in only one direction. Why?
The compass is not in Earth's magnetic field.
500
How do recycling centers use electromagnets to separate discarded material?
Electromagnets attract only certain metals, so they can separate these metals from other materials.
500
A classmate says you don't need to conserve electricity because your local power plant does not produce pollution. Are there other reasons to conserve electricity?
To save money and nonrenewable resources
500
What is the difference between a permanent magnet and temporary magnet?
Permanent magnet - keeps its magnetism for a long time
Temporary magnet - looses magnetism after a short time