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# Magnetism

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### Magnetism

1. 1. Warm-Up Activity 2/2/09 <ul><li>Get a MAGNETISM ATTRACTION WKT. </li></ul><ul><li>Staple it in your science journal. </li></ul><ul><li>Work with your shoulder partner to complete the assignment. </li></ul><ul><li>You will have about 10 minutes to complete this mini-lab. </li></ul>
2. 2. Electrical Power
3. 3. Electrical Power - the rate at which electrical energy is changed into other forms of energy; measured in watts
4. 4. How can series and parallel circuits be used to control the amount of electric energy produced?
5. 5. The resistance in a series circuits is increased by adding loads (slows down the flow of electrons) whereas the resistance in a parallel circuits is decreased by adding loads (increase the flow of electrons).
6. 6. What makes an object a magnet?
7. 7. A magnet is an object that is surrounded by a magnetic field and that has the property of attracting iron.
8. 8. Two Poles - the area of a magnet where the magnetic effect is the strongest; every magnet has two poles – often called north and south Properties of a Magnet
9. 9. Magnetic Force - attracting (pulling) or repelling (pushing) other magnets and some other materials (e.g. iron and steel); caused by moving or spinning electric charges Properties of a Magnet
10. 10. Properties of a Magnet
11. 11. Magnetic Field - area around the magnet in which magnetic forces act; concentrated into a pattern of lines that extend from the magnet’s north pole to its south pole. Properties of a Magnet
12. 12. Properties of a Magnet
13. 13. Magnetic energy results when an object is moved a distance by a magnetic force. Properties of a Magnet
14. 14. <ul><li>Two Kinds of magnets </li></ul><ul><li>Temporary - easy to magnetize and demagnetize easily </li></ul><ul><li>Permanent - hard to magnetize or demagnetize </li></ul>Properties of a Magnet
15. 15. How is a magnet made?
16. 16. For an object to be magnetic, most of its domains (tiny magnetic fields produced by spinning electrons) must line up in the same direction.
17. 18. Losing Magnetic Alignment by: a) Dropping a magnet or hitting it too hard b) Putting magnet in opposite field for too long c) Increasing the temperature
18. 19. What do you think would happen if you cut a magnet in half? (Not in your notes – Add in left column)
19. 20. If you cut a magnet in pieces, each piece will still be a magnet with two poles.
20. 21. Why does a compass point to the Earth's North Pole?
21. 23. Why does a compass point to the Earth's North Pole? A compass points to the Earth’s North Pole because the Earth acts like a giant magnet. Earth has a north magnetic pole and a south magnetic pole. Earth’s magnetic poles are not exactly the same locations as the geographic poles (axis where the Earth spins).
22. 24. Why does a compass point to the Earth's North Pole? A compass needle points north because the magnetic pole of Earth that is closest to the geographic North Pole is a magnetic south pole. A compass needle points to the north because its north pole is attracted to a very large magnetic south pole.
23. 26. Earth’s magnetic field plays a part in making auroras. An aurora is formed when charged particles from the sun hit oxygen and nitrogen atoms in the air. The atoms become excited and then give off light of many colors.
24. 27. Earth’s magnetic field blocks most of the charged particles from the sun. But the field bends inward at the magnetic poles. As a result, the charged particles can crash into the atmosphere at and near the poles. Auroras seen near Earth’s North Pole are called the northern lights, or aurora borealis (aw RAWR uh BAWR ee AL is). Auroras seen near the South Pole are called the southern lights, or aurora australis (aw RAWR uh aw STRAY lis).