Magnetism

1. Magnetic Force Repel or attract Stronger force as magnets move closer together Force weakens as magnets move away from each other

2. Magnetic Field Field exerts the magnetic force Strongest close to the magnet

3. Magnetic Poles All magnets, regardless of shape, have a north and south pole Area where force is strongest Magnetic field lines connect the two poles

4. Magnets Interact Two north poles repel each other; two south poles repel each other North and south poles attract each other

5. Earth’s Magnetic Poles Earth’s magnetic south pole is located in Canada Opposite of what you think when you look at a map or globe

6. Compass Shows direction Needle is a bar magnet North pole of the needle will point toward the Earth’s magnetic south pole (page 229) Needle lines up to field lines

7. Magnetic Materials Magnets are attracted to iron, cobalt, and nickel In these atoms, electrons and protons do not cancel out…so these atoms have their own magnetic fields

8. Temporary Magnet Domains Magnetic domains (N/S) are random until magnetized and then they line up (page 231)

9. Permanent Magnets Magnetic material in a strong magnetic field Domains are permanently aligned (Looses strength if dropped or heated – causes domains to come out of alignment) Broken in two – new poles are created