Magnets

Magnets are objects that create magnetic fields. These invisible fields can pull on some metals, such as iron, and can push or pull other magnets. Every magnet has a north pole and a south pole.

Magnetic Fields

You can see the shape of a magnetic field by sprinkling iron filings near a magnet. The filings line up in curved patterns because each tiny piece is pulled by the field. If you break a magnet in half, you do not get a north piece and a south piece. You get two smaller magnets, each with both poles.

Strong Magnets

Neodymium magnets are extremely strong for their size. They are useful in motors, tools, speakers, and machines, but they can be dangerous if handled carelessly. Two strong magnets snapping together can pinch hard enough to injure a finger.

Magnets in Motion

Magnets help create sound inside headphones and speakers. Electric signals make a magnetic part vibrate, and those vibrations push air as sound waves. Magnets can also lift trains. Maglev trains use magnetic forces to float above tracks, which helps them move very fast with less friction.

Fun Facts

• Powerful magnetic fields have been used in experiments to levitate a small frog.
• Earth acts like a giant magnet with a magnetic field around it.
• A compass needle points north because it lines up with Earth's magnetic field.

Did You Know?

Scientists use magnetism in MRI machines to help doctors see inside the body without surgery.