1. Magnetism

2. Magnetism An unseen force that attracts certain metals Magnetic
Ex: Metals containing the elements
Iron, Cobalt, Nickel
Non-magnetic
Ex: plastic, wood, glass, rubber

3. Attraction vs Repulsion
Each magnet has a north and south pole
Attraction: Opposite poles attract
or pull toward each other
Repulsion: Like poles repel
or push away from each other

4. Three Types of Magnets Permanent – stays magnetized for a long time
EX: Whiteboard Magnet
Temporary – loses its magnetism after only a short time
EX: Paperclip
Electromagnets – a tightly wound coil of wire which acts like a permanent magnet when current is flowing in the wire
EX: Electromagnet in a doorbell (any electronic device)

5. Magnetic Field

6. The Magnetic Field Every magnet has two poles (North and South)
The magnetic field, or strength of the magnet, is concentrated at the poles
The field exists in all directions but decreases in strength as distance from the poles increases
Less distance = stronger magnetic force
Less mass = stronger magnetic force

7. Examples of Magnetic Fields
The Magnetic Field
Earth’s Magnetic Field