What's In the Bag?
Name three items that attract to magnets. Tell why they do this.
Name three of the following: steel nail, paper fastener, black rock, paper clip, screen, screw, washer.
These objects attract to a magnet because they have iron or steel in them.
Give two names for the black rock.
Magnetite and lodestone
View Card A and answer the question.
The track's magnets repel the magnets at the bottom of the train--they are the same poles facing each other.
WHY doesn't the black rock conduct electricity, yet it attracts to magnets?
The black rock has iron in it, which allows it to attract to a magnet. However, the iron is mixed in with other minerals, so electricity can't go through it like it could with pure iron.
Demonstrate the following for us using materials from the science table:
Turn a nail into a temporary magnet.
Student should use a permanent magnet, a steel nail, and iron objects to demonstrate attraction of iron to the nail.
Name six objects from the bag that conduct electricity. Tell why they conduct.
Name six of the following: aluminum foil, aluminum nail, brass ring, copper foil, paper fastener, steel nail, paper clip, screen, screw washer.
These items conduct electricity because they are made of metal and have nothing coating or covering the metal.
Same poles of a magnet will __________ when they come in contact with each other.
REPEL
View Card B and answer the question.
Card B shows a parallel circuit. One can tell because each light has its own path.
WHY does this happen? (Teacher demonstration: place a magnet under a notebook and move a paper clip on the top.)?
The magnetic force or field can move right through non-metal objects.
Demonstrate the following for us using materials from the science table:
PROVE that magnetism can go through plastic.
Student should use a permanent magnet, something made of plastic, and iron objects. The permanent magnet should attract iron through the plastic.
Name four objects from the bag that conduct electricity and also attract to magnets. Why isn't aluminum foil one of them?
Name four of the following: steel nail, paper clip, screen, screw, washer, paper fastener.
Although all metals conduct, only the ones made of iron attract to magnets also.
When you use a permanent magnet to create a temporary magnet out of a steel nail, you are ________ magnetism into the nail. (supply a VERB)
INDUCING
View Card C and answer the question.
The pole is SOUTH.
HOW could you quickly find objects made of iron in the library?
You could take a magnet in the library. Anything that attracts to it has iron in it.
Demonstrate and explain the following for us using materials from the science table:
Find the north pole of a doughnut magnet.
Student should a permanent magnet with labeled poles to find the north pole of a doughnut magnet using knowledge that same poles repel or opposite poles attract.
Name something in the bag that will attract to a magnet, yet will not conduct electricity.
The black rock.
Name two types of permanent magnets.
Select from the following: doughnut, bar, horseshoe, or the mineral in the black rock.
View Card A and answer the question.
The pole is NORTH.
WHY and HOW does a iron object become a temporary magnet when it comes in contact with a magnet? (Use the word atoms or particles in your answer.)
The particles or atoms inside an iron object that we can't see straighten when a magnet comes near it.
Demonstrate and explain the following for us using materials from the science table:
PROVE to us that as the distance between two magnets increases, the strength of attraction decreases.
Student should duplicate activity done in class with balance scale, magnets, spacers, and washers.
Name five items from the bag that could be turned into a temporary magnet. What do these objects have in common?
Name five of the following: paper fastener, steel nail, paper clip, screen, washer, screw.
Only items made of or from iron can become temporary magnets.
The force of ______________ is what holds us to the ground, and should not be confused with the force of magnetism which attracts and repels iron.
GRAVITY
View Card E and answer the question.
The pole is SOUTH.
WHY and HOW do compasses find north on the earth, but not on the moon?
Earth has a magnetic field around it and the moon does not. Compasses are free floating magnets that attract to the Earth's magnetic north pole naturally.
Demonstrate and explain the following for us using materials from the science table:
PROVE to us that the force of attraction of two magnets together is greater than the force of attraction of only a single magnet.
Student should use one magnet, then two together to pick up iron objects and count the number. The more picked up, the stronger the force.