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181 magnets & magnetism revised.notebook
1
March 29, 2017
Jan 185:21 PM
Magnets
Jan 184:55 PM
Magnet any material that attracts iron.
Properties of Magnets.• All magnets have a north pole and a south
pole.> If you break a magnet in half, each half
will have a N and S pole.> Just like with electric charge...– Like magnetic poles repel– Opposite poles attract.
181 magnets & magnetism revised.notebook
2
March 29, 2017
Jan 185:44 PM
Checkpoint: Are these magnets attracting or repelling?
Jan 185:43 PM
• Magnets are surrounded by a magnetic field.
Draw me!
Magnetic field lines indicate the flow of magnetic force.
181 magnets & magnetism revised.notebook
3
March 29, 2017
Jan 185:45 PM
• Magnets are made of the metals iron, nickel or cobalt.
Jan 185:52 PM
• These metals are magnetic because their magnetic domains (groups of atoms) all line up in the same direction.
• The Earth is a giant magnet...it has an iron/nickel core.
How do we know Earth has an iron/nickel core?