8th grade ch. 1 sec. 1 the nature of magnetism

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