Magnets Attract Some Materials.
A. MAGNETIC OBJECTS.
Thumbtacks
Thumbtacks
Steel Spoon
Iron nail
Objects that are made of iron, steel or nickel can be attracted by magnets. They are called magnetic objects.
B. NON-MAGNETIC OBJECTS.
Objects that are made of wood, plastic, glass or gold cannot be attracted by magnets. They are called non-magnetic objects.
Which Magnet Is the Strongest?A good way to test how strong different magnets are is to see how many magnetic objects it can attract. Try this experiment with your magnets!
What You Will Need:
What You Will Need:
- Several magnets
- Box of paperclips
- Notebook
- Pencil
- Someone to help you
- Have your helper hold on to one end of one of the magnets. Stick one paperclip to the other end of the magnet. One end of the paperclip should dangle off the magnet. (Your magnet may be really strong, so you may need your helper to hold the paperclip so just an end is touching the magnet rather than the side of the paperclip, like in the picture.)
- Now touch another paperclip to the end of the first paperclip to start a paperclip chain. Keep adding paperclips until no more stick to the chain. In your notebook, write down how many paperclips the magnet was able to hold together in a chain before paperclips started to fall off.
- Do steps 1 & 2 with the other magnets, recording in your notebook how many paperclips would stick in a chain to each magnet.
What's Happening?
When a magnet touches another magnetic object (such as a paperclip), the object becomes a temporary magnet for as long as it is touching the real magnet! It can now be used to pick up more paperclips. Each additional paperclip also becomes a temporary magnet with a weaker magnetic force than the one before it. Some magnets may be able to hold a chain of five paperclips while another magnet may only be able to hold one or two paperclips. How many paperclips a magnet can hold is a good indication of its strength. If you have a strong enough magnet and lift up the paperclips long enough, you may find that some of the paperclips will keep the ability to act like magnets for a little while even when they are not touching the magnet. If this happens, you have just made a very strong temporary magnet.
When a magnet touches another magnetic object (such as a paperclip), the object becomes a temporary magnet for as long as it is touching the real magnet! It can now be used to pick up more paperclips. Each additional paperclip also becomes a temporary magnet with a weaker magnetic force than the one before it. Some magnets may be able to hold a chain of five paperclips while another magnet may only be able to hold one or two paperclips. How many paperclips a magnet can hold is a good indication of its strength. If you have a strong enough magnet and lift up the paperclips long enough, you may find that some of the paperclips will keep the ability to act like magnets for a little while even when they are not touching the magnet. If this happens, you have just made a very strong temporary magnet.
Good information on magnets.
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BalasPadam