Magnetism

Why do Magnets Stick Together?

• Magnets have a magnetic field that surrounds them. This field is what causes the attraction and repulsion forces that we can feel when we play with magnets.

• The field is strongest around the ends which are called poles. Each magnet has one north pole and one south pole.

• Like poles repel, and opposite poles attract.

Electricity to Magnetism

• Moving electricity creates magnetic forces.

• These are called electromagnets which can actually be turned on and off.

Moving magnetic fields create electric forces.

This is how generators work.

Types of Magnets

Permanent Magnets

A magnet that keeps its magnetic properties for a long time

Examples:

LodestoneBar MagnetEarth

Temporary Magnets A magnet that

keeps its magnetic properties for a short time

Examples:

ElectromagnetMetallic Materials

Magnets have BOTH a N and a S pole, no matter how many times you “chop

it up.”

S NS N S N

The Earth is a magnet!

• Magnetic lines of force around the earth are like the field lines around a giant bar magnet.

WATER is a MAGNET!• The water molecule behaves like a magnet because of distribution of charged particles in

the molecule!

• WATER IS POLAR LIKE A MAGNET!

Magnetic Effects

Aurora – Colorful light display caused by collisions between charged particles from the sun interacting with particles in Earth’s atmosphere.

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