Magnetism - They're Everywhere!
Magnets are everywhere. If you have ever used a computer, microwave oven, copy machine or stereo speakers, you have used magnets!
Magnets can also be used to make electricity.
Think about it!
What is the biggest magnet around? Use the hints below to figure it out and then highlight the box to see if you were correct.
- It is bigger than a bread box.
- It is bigger than a whale.
- It is bigger than a mountain.
- It is bigger than North America.
- You live on it!
What is the biggest magnet?
The Earth is a huge magnet.
What is a magnet, anyway?
A magnet is something that has magnetic force.
The next question is "What is a magnetic force?" A magnetic force attracts iron and steel.
Magnets are materials that attract iron and steel.
There are many different types of magnets. Natural magnets occur naturally in nature. The mineral magnetite is a natural magnet. It can attract iron.
Make a magnet!
A temporary magnet is a magnet that has magnetic force for a short time. You can make a temporary magnet.
- Large nail with a small head (Reminder: Nails are sharp - be careful!)
- Bar magnet
- Straight pins
- Rub the nail with one end of a bar magnet, and make sure to rub the nail in the same direction each time.
- Using the other end of the magnet, stroke the opposite end of the nail several times.
- Slowly move the nail near some lightweight metal objects such as straight pins.
- Record what happens. Why do you think that some metal objects will not be attracted to magnets?
You can magnetize a piece of steel needle by rubbing a magnet in one direction along the needle. This creates a magnetic force in the needle so it acts like a magnet. Soon, however, the needle will lose its magnetic force. You can do the same thing with a paper clip. It also will lose its magnetic force quickly. Try it!!
Permanent magnets keep their magnetic force. The magnets that you used to magnetize the needle or paper clip, the magnet used to stick reminders to your refrigerator, and the magnets that engineers use in dams to make electricity are examples of permanent magnets.