1. Ch 1 – What Are Magnets By
Mrs. Horvath

2. Properties of Magnets
Magnet – an object that attracts, or pulls on, certain materials made of iron and steel
Magnetism – a magnet’s property of attracting metal

3. Two Kinds of Magnets Permanent Magnets
Keeps its magnetism for a long time
Made in a factory
Ex: refrigerator magnet
Temporary Magnets
don’t keep its magnetism for a long time
Ex: nail stroked with a permanent magnet

4. North and South Pole
North Pole – one end of a magnet always points north (called north-seeking)
South Pole – one end of a magnet always points south (called south-seeking)

5. Attract & Repel Unlike poles  ATTRACT Like poles  REPEL

6. Maglev Trains Mag = magnetic
Lev = levitation (rise or float in the air)
Goes fast
Quiet and smooth (no friction)
- friction – force caused by two surfaces
rubbing against each other
Eco-friendly (doesn’t pollute)

7. Force Fields Lines of Force Formed by iron filings
Shows how force field spreads between the poles of a magnet
Strongest / heaviest at the poles
Magnetic Force
Space in which the force of a magnet can act

9. Properties of Magnets Attract objects made of metal (iron or steel)
Force is strongest/greatest at the poles (N or S)
Like poles > REPEL (push away)
Unlike/opposite poles > ATTRACT (stick)

10. Earth as a Magnet Earth is a giant magnet! Lodestone
Naturally magnetic rock
Found near Earth’s surface
Discovered 2,000 years ago
Chinese sailors used to make 1st compass
Compass
Magnetized needle that swings freely
Points NORTH

12. Earth’s Magnetism Earth’s center – made up of IRON
Earth spins on its AXIS (cause)…
has magnetized the iron inside (effect)

13. Earth’s 2 Sets of Poles Earth has 2 sets of poles
Geographic Pole – end of the imaginary line (AXIS) around which the Earth spins (ROTATES)
Magnetic Pole – 1,000 miles from the geographic pole

15. Magnetism Lights Up the Sky
Northern / Southern Lights
Display bright colors in sky
Auroras
Particles of matter in space attracted to Earth’s magnetic field (giant magnet)
Particles collide (crash) together & display light
Earth’s force field strongest at the poles so more lights are seen there

17. What I Know
Pick up metal
Two of same poles can’t attract
Opposite poles attract
Different sizes & shapes (ex: bar magnets)
What I Want to Know
Pick up metal
Two of same poles can’t attract
Opposite poles attract
Different sizes & shapes (ex: bar magnets)
What I Learned