magnetism
TRANSCRIPT
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Module II – MAGNETISM
Objective:2.1 Distinguish magnetic substances
from ferromagnetic, and non-magnetic substances.
2.2 Map the magnetic fields of magnetized objects.
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History of Magnetism
Discovered by the Chinese Used by magicians and sailors Illusions…..
Magnetic Hill, New Brunswick Bermuda Triangle
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Categories of Substances
Three Categories Magnetic
Ferromagnetic
Non-magnetic
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Magnetic
Object that has a field and that can attract some other objects. Example: horseshoe magnet
Invisible fields Attract or repel
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Ferromagnetic
Is attracted by a magnet Can be magnetized Must contain iron, nickel or cobalt
eg: paper clip or nail
Not a magnet
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Non-Magnetic
Is not attracted by a magnet Example: glass, plastic, or wood
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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 & opposite poles attract.
Repulsion
AttractionImportant
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Poles
N attracts SouthS attracts North
N repels NorthS repels South
Important
Oppositesattract
Likesrepel
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Around a magnet there are lines of force that have direction and strength (magnetic field).
Mapping Magnetic FieldsRemember
•the lines never cross•Always goes from North to South•Closer the lines, stronger the attraction
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Compass
The needle of the compass is magnetic Red Tip of needle is North Red Tip will always be attracted towards
South
Important
Northend
Example #1
Example #2
Tip of arrowIs North thereforeIt is attracted to South
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Why the Compass Works
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Why the Compass Works
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Magnetism is a property that makes certain material attract or repel.
Ferromagnetic Attracted by magnet Must contain Fe, Ni, Co
Nonmagnetic Not attracted by magnet
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
HINTNerd
toSexy
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Activities
Worksheet Mod II, # 1