Transcript magnetic pole

B.O.S.S.
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Biospheric Outer Space Simulation
2 Missions (April 22 & April 29)
20 Students (10 per mission)
10 boys & 10 girls
Science Starter: Week 9, Monday
• Sea Turtles return to the very same beaches they
were born at to lay their eggs.
• In some cases the turtles migrate across the entire
Pacific Ocean to reach their home beach. How are
the turtles able to return to the exact same beach
they were born at, after traveling thousands of
miles and being gone for several years?
The Nature of Magnetism
Common Uses for Magnets
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TVs and computers
Credit cards
Speakers & Microphones
Hospitals
Power cords
Mechanics
Section 1 Objectives
• By the end of the section you should be able
to:
• 1. Define magnetism
• 2. Describe magnetic poles and the
interaction between like and unlike poles
Magnets
• Magnets have been in
use for over 2,000 yrs.
• In Magnesia, Greece the
mineral magnetite was
discovered in rocks. The
people saw that these
rocks attracted iron.
• Magnetism- comes
from Magnesia and is
the attraction of a
magnet for another
object.
Magnets
• About 1,000 yrs. ago people discovered that by
hanging a piece of magnetite from a string, one part
of the rock would always point at a certain star.
• What star was this?
• North Star or the direction North
Magnetic Poles
• Any magnet, no matter what its shape, has
two ends, each one called a magnetic pole.
• A pole is an area of a magnet where the
magnetic effect is strongest.
Magnetic Poles
• How many poles does a magnet have?
• 2 ( a north pole and a south pole)
• Two north poles or two south poles = alike
poles
• One north pole and one south pole = unlike or
opposite poles
Magnetic Interactions
• Opposites Attract!
• Magnetic poles that are alike repel each other
and magnetic poles that are unlike attract
each other.
Magnetic Interactions
• What would happen if you broke a magnet
into two pieces?
• Would you have one piece be the north pole
and the other piece be the south pole?
Magnetic Fields
• Magnetic Field- the region of magnetic force
around a magnet
• You can not see a magnetic field, but you can
see it’s effects.