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Ch. 1Sec. 1 What is
magnetism?
Activity- Magnetic or NotObject Prediction
(magnetic or not)Result(magnetic or not)
1. foam No
2. plastic button No
3. cardboard No
4. magnet Yes
5. spring Yes
6. paper clip Yes
7. screw Yes
8. key Yes
9. jean button Yes
10. bingo chip No
11. balloon No
12. cloth No
Where does each magnet hold the greatest Where does each magnet hold the greatest
number of paper clips?number of paper clips?
Bar magnet Horseshoe magnet
Circle magnet
What do all magnets have in common?
Strong magnets move this Japanese maglev
train.
magnet•any material that attracts iron
& materials that contain iron•one part always points north
magnetism•attraction of magnet for another object
lodestone•magnetic rock •contains mineral- magnetite
magnetic pole•1 of 2 ends of magnet•strongest magnetic effect•Like poles repel•Unlike poles attract
Remember, opposites attract!Remember, opposites attract!
magnetic force
•attraction or repulsion between magnetic poles
magnetic field•area of magnetic force around magnet
magnetic field lines• invisible lines
that map out magnetic field around magnet
•spread out from 1 pole curve around magnet return to other pole
magnetic field lines
The magnetic field of a single bar magnet is altered when another bar magnet is brought near it.
Magnet Song
Magnets…• Magnetic field lines• Some planets are magnetic• Opposite poles attract-similar ones do not • North and south pole• Magnets attract• 2 poles both have different forces• World is one big magnet• When you break a magnet, it still works• Magnets make Japanese train move• Magnets have a magnetic field around them