1. Magnetism

2. Magnetism The property of attracting certain metals
An invisible or noncontact force
Involves a push or a pull

3. Purpose of Magnets Why do we use magnets? To hold objects together
To connect to other objects
To separate objects/groups of objects
Common Uses
Refrigerators
Junkyards
White boards
Doorbells
Electronics
Compasses

4. Purpose of Magnets

5. C cobalt I iron N nickel S steel
Magnetic Materials
C cobalt I iron N nickel S steel

6. Magnetic Materials
Cobalt Iron Nickel Steel

7. Attract or Repel? Attract – a pull “Opposites Attract”
North to South or South to North
Can occur with a magnet and a magnetic material or with two magnets
Repel – a push
“Likes Repel”
North to North or South to South
Can only occur with two magnets

8. Attract or Repel?

9. The invisible force field around a magnet and the Earth
Magnetic Field
The invisible force field around a magnet and the Earth

10. Electromagnets
A type of magnet where the magnetic field is produced by an electric current