1. Answer the following
Why would a train move faster using electromagnets?
Where are magnets the strongest?
Since we know the Aurora Borealis occurs because of magnetism, why do you think it only occurs in 2 places on earth?

2. Magnet Making and Breaking

3. Magnetic Domains Tiny fields of magnets normally go all directions
When we can organize them in one direction we get magnetism

4. Magnet Types Two categories of magnetism – Temporary and Permanent
Temporary Magnet – loses magnetism easily
Permanent Magnet – Hard to magnetize, but keeps charge for a long time.

5. Permanent Magnets Ferromagnetic Materials –
These type of magnets are going to have strong magnetic properties
EXAMPLES: Iron, Nickel, cobalt, gadolinum, neodymium
Metal alloy – ALNICO
Aluminum, nickel, iron and cobalt
Cheap and easy to make, very common
Most common magnets nowadays are Ferrite
Chips easy, but cheap and strong
Think Fridge Magnets

6. Ferrofluids
Liquids (Usually oils) mixed with magnetic materials that will react to magnetic fields
FERROFLUID VIDEO (WATCH THIS)

7. Making a stronger magnet
The better the domains are aligned – stronger the magnet
MRI Machines are an example of very strong electromagnets being used for a specific purpose.