2.  More than 2000 years ago – Greeks discovered a rock that was attracted to materials that contained iron.  MAGNETITE was this rock

3.  LODESTONE – made from magnetite (Fe3O4)  Used to make a compass used by ancient Greek & Chinese

4.  The ability of a substance to attract iron  Magnets have magnetic poles.  There are two poles: 1) North Seeking Pole (NORTH) 2) South Seeking Pole (SOUTH)

6.  The region around a magnet where the magnetic force acts & is composed of lines of force.

7.  Opposite poles = force of attraction  Like poles = force of repulsion  What does that look like?

12. REPEL ! ATTRAC T!

16. This is a MRI machine. MRI stands for: Magnetic Resonance Imaging

18.  Temporary – made by induction, magnetism that only occurs in the presence of a magnetic field  Permanent – simply b/c some materials are SO influenced by magnetic fields, they become magnets themselves (Fe, Ni, Co)

19. Alignment of particles in the material can determine whether it will be magnetic or not.