Module II – MAGNETISMObjective:2.1 Distinguish magnetic substances    from ferromagnetic, and non-    magnetic substances....
History of Magnetism   Discovered by the Chinese   Used by magicians and sailors   Illusions…..     MagneticHill, New ...
Categories of Substances   Three Categories     Magnetic     Ferromagnetic     Non-magnetic
Magnetic    Invisible fields                Attract or repel   Object that has a field and that can    attract some other...
Not a magnetFerromagnetic   Is attracted by a magnet   Can be magnetized   Must contain iron,     nickel or cobalt    ...
Non-Magnetic   Is not attracted by a magnet   Example: glass, plastic, or wood
Important Facts about Magnets     Facts:        All magnets have two         poles, a North (N) and a         South (S). ...
ImportantPolesN attracts South   Opposites                    attractS attracts NorthN repels North      LikesS repels Sou...
Mapping Magnetic Fields    Remember Around lines never cross      •the a magnet there are lines of      •Always  force th...
Compass                                                            North            The needle of the compass is         ...
Why the Compass Works
Why the Compass Works
   Magnetism is a property that makes certain material    attract or repel.   Ferromagnetic       Attracted by magnet  ...
Activities   Worksheet Mod II, # 1
Upcoming SlideShare
Loading in …5
×

AST 406 Magnetism

1,175 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,175
On SlideShare
0
From Embeds
0
Number of Embeds
619
Actions
Shares
0
Downloads
13
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

AST 406 Magnetism

  1. 1. Module II – MAGNETISMObjective:2.1 Distinguish magnetic substances from ferromagnetic, and non- magnetic substances.2.2 Map the magnetic fields of magnetized objects.
  2. 2. History of Magnetism Discovered by the Chinese Used by magicians and sailors Illusions…..  MagneticHill, New Brunswick  Bermuda Triangle
  3. 3. Categories of Substances Three Categories  Magnetic  Ferromagnetic  Non-magnetic
  4. 4. Magnetic Invisible fields Attract or repel Object that has a field and that can attract some other objects.  Example: horseshoe magnet
  5. 5. Not a magnetFerromagnetic Is attracted by a magnet Can be magnetized Must contain iron, nickel or cobalt  eg: paper clip or nail
  6. 6. Non-Magnetic Is not attracted by a magnet Example: glass, plastic, or wood
  7. 7. Important Facts about Magnets Facts:  All magnets have two poles, a North (N) and a South (S). They are known as dipoles.  Fields are infinite in size & 3-Dimensional  Similar poles repel & Repulsion opposite poles attract.Important Attraction
  8. 8. ImportantPolesN attracts South Opposites attractS attracts NorthN repels North LikesS repels South repel
  9. 9. Mapping Magnetic Fields Remember Around lines never cross •the a magnet there are lines of •Always force that goes fromstronger the attraction have direction South strength •Closer the lines, North to and (magnetic field).
  10. 10. Compass North  The needle of the compass is end magnetic  Red Tip of needle is North Important  Red Tip will always be attracted towards South Tip of arrow Is North thereforeExample #1 It is attracted to SouthExample #2
  11. 11. Why the Compass Works
  12. 12. Why the Compass Works
  13. 13.  Magnetism is a property that makes certain material attract or repel. Ferromagnetic  Attracted by magnet  Must contain Fe, Ni, Co HINT Nonmagnetic Nerd  Not attracted by magnet to Sexy Opposites attract (i.e N & S) Likes Repel (i.e. S & S or N & N) Magnetic Field  Arrows always go from north to south (outside magnet)  Lines of force never cross  The closer the lines, the stronger the field Compass  Red portion of compass needle is North and is always attracted to South
  14. 14. Activities Worksheet Mod II, # 1

×