# 2-3 Magnetism

### Lesson List

Magnetism is a force all around us.  It cannot be seen but the way it acts can be seen.  Magnets exert a force of attraction on anything made of iron.  Anything made of iron will be attracted to a magnet.  A magnet will not attract things that are not made of, or do not contain iron.

 N S

Look at the magnet above.  It is called a bar magnet.  It has two ends.  The end labeled N means north.  The end labeled S means south.  These two ends are the magnetic poles.  The force of a magnet is strongest at the poles.  If you tie a string to the middle of a bar magnet, the north end will point north and the south end will point south.

The earth is like a giant magnet!  The magnetic fields surrounding earth are near the North Pole and the South Pole.  That is why the poles or ends of a bar magnet are called north and south.

Look at the magnets below.  The south pole of a magnet attracts the north pole of another magnet.

 N S N S Unlike poles attract

Repel means "push away" or "push apart."  Look at the magnets below.  The north pole of the magnet repels the north pole of the other magnet.

 S N N S Like poles repel

Try it yourself! Get two bar magnets and experiment with them.