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Ch 1 magnets1
This document provides information about the properties and behavior of magnets. It explains that magnets attract certain metals like iron and steel, and that their force is strongest at their poles. It also describes how opposite poles attract each other while like poles repel. The document notes that magnetism causes the northern lights and allows compasses to work by aligning with Earth's magnetic field.
Ch 1 magnets1
- 1. Ch 1 – WhatAre Magnets http://www.sodahead.com/ By Mrs. Horvath
- 2. Properties of Magnets •Magnet – an object that attracts, or pulls on, certain materials made of iron and steel http://totalwealthco aching.com/wp/wp- content/uploads/20 09/05/magnet.png • Magnetism – a magnet’s property of attracting metal
- 3. Two Kinds ofMagnets 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 http://crafts.preschoolrock.com/uploads/images/Finished%20Magnets.jpg http://www.all-science-fair-projects.com/phase2/app/webroot/files/image/387/nail2.gif
- 4. North and SouthPole • 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) http://commons.wikimedia.org/wiki/File:Bar_magnet.jpg
- 5. Attract & Repel •Unlike poles ATTRACT • Like poles REPEL http://www.ngfl-cymru.org.uk/vtc/ngfl/science/107/PP-electricity.html
- 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 http://ww w.dodevi ce.com/w rubbing against each other p- content/u ploads/20 • Eco-friendly (doesn’t pollute) 08/03/ma glev- train.jpg
- 7. Force Fields Lines ofForce • 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 aMagnet • 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’scenter – made up of IRON • Earth spins on its AXIS (cause)… • has magnetized the iron inside (effect)
- 13. Earth’s 2 Setsof 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
- 15. Magnetism Lights Upthe 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 What I Want to Know What I Learned • Pick up • Pick up metal metal • Two of same • Two of same poles can’t poles can’t attract attract • Opposite poles • Opposite attract poles attract • Different sizes & • Different shapes (ex: bar sizes & magnets) shapes (ex: bar magnets)