1. Magnets

2. Magnet An object that pulls certain metals towards it.

3. Magnets A magnet has a force. A force is a push or a pull.

4. Magnetism Magnetism is a force that makes a magnet able to push or pull another object

5. Types of Metals that are attracted…INCS I.N.C.S. Iron Nickel Cobalt Steel

6. A rock…magnetic?. lodestone is a rock that occurs in nature and is magnetic

7. Magnetic Field space around a magnet where the force of the magnet can still work.

8. Magnetic Field Image From: http://www.bbc.co.uk/schools/ks3bitesize/science/images/magnetic_field s.gif

9. Magnetic Poles. areas of the magnet where a magnet’s attraction is the strongest

10. North and South Magnets have two ends, they are also called poles. The poles are named North and South.

11. Attract A magnet attracts certain metals

12. Attract To Pull Together S N

13. Repel To push apart S N N S

14. 2 Types of Magnets. Temporary Magnet – an object that loses its magnetism after a short time Permanent Magnet- an object that keeps its magnetism for a long time

15. Compasses This device shows direction

16. Compasses A compass works because Earth is surrounded by a magnetic field.

17. Compasses North on a compass is attracted to Earth’s Magnet

18. Magnets are Everywhere Refrigerators Cars Heavy machinery

19. North and South N N S S

20. Repel or Attract S N N S S N S N Repel Attract

21. Different Kinds of Magnets N N S S Bar Magnet Horseshoe Magnet

22. Review (What kind of magnets are these? N N S S Bar Magnet Horseshoe Magnet

23. Earth is a Magnet Earth is like a magnet because it has melted iron (molten)deep inside

24. Earth is a giant bar magnet

25. Earth’s Magnetic Field Image From: http://oceanexplorer.noaa.gov/explorations/05galapagos/logs/dec22/medi a/magfield_600.gif

26. Magnetic or Not

27. Review Magnets have 2 _______. What 4 types of metals do magnets attract? iron, nickel, cobalt, and steel poles Magnets attract _____________. metals

28. Review Where are some places you can find magnets? How does a compass work? The magnet on the compass is attracted to Earth’s magnet refrigerators, can openers, machinery, etc Earth is like a giant __________. magnet

29. Review To pull together is to ______. Can 2 like poles pull together? No attract To push apart is to ______. repel

30. Review Can two opposite poles pull together? What are the end points on a magnet called? poles yes Why is the earth like a giant magnet? is has melted iron inside

31. Review What is molten? Where is a magnet the strongest? at its poles melted iron Which object is not magnetic? steel nail, iron lock, plastic glass plastic glass

32. Review Why does a compass always point north? What is the name of a magnetic rock? lodestone because its magnetic needle is attracted by the magnetic force given off by Earth’s North Pole What do we call magnets that lose their magnetism after a short time? temporary magnet