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Transcript
Prentice Hall Physical Science: Magnets I
Starting on page 612, answer the following questions:
1. Does a magnetic train vibrate the way the L.I. Railroad does? Explain.
2. Magnets can be found in _____, _____, _____.
3. For how many years have people been fascinated with magnets?
4. Who were the first people who discovered magnets?
5. What is magnetite?
6. Define magnetism.
7. If you suspend a magnet from a string, which way will it point?
8. Magnets have two ends called _______ ______ .
9. Which end is the north pole of the magnet?
10. Which part of the magnet has the strongest strength?
11. What happens if you bring two north poles together?
12. What happens if you bring two south poles together?
13. What happens if you bring a north and a south pole together?
14. Like poles ______.
15. Unlike poles ______ .
16. The force that exists between poles is called _______ .
17. Why does the magnet train in Japan ride on a “cushion of air”?
18. If you break a magnet in half, what happens?
19. Continuing on page 615: Where is the magnetic force the strongest?
20. Is the magnetic force only on the magnet?
21. Define magnetic field.
22. Magnetic fields allow magnets to ____ force, without ____ .
23. The magnetic field is mapped out by ______ ______ ______ .
24. The _____ _____ ______ extend from one _____ to the other.
25. Can you see a magnetic field.
26. How can iron filings help you view the field?
27. Are magnetic fields 2d or 3d?
28. The magnetic properties of a substance depend on the ____ __ __ ____ .
29. The _____ and _____motion of the _______ make each atom a tine ___ .
30. What is a magnetic domain?
31. How many atoms does it take to make one?
32. Do all substance have good magnetic domains?
33. A material with a strong magnetic domain is said to be a _______ ______
34. Answer the question in figure 7 on page 617.
35. Continuing on page 618: ______ exists in nature.
36. However most _______ are made by ______ .
37. When you place an unmagnetized material in a strong magnetic field,
what happens to the domains, making this new material magnetic?
38. Explain how a paperclip can become a magnet?
39. Explain why the paperclip does not remain a magnet forever.
40. Materials the magnetize easily _____ the magnetic properties _____.
41. Materials that magnetize not as easily, tend to ______ ________ .
42. Name two ways to destroy a magnet?
43. When destroyed, what does this do to the magnetic domains.