S3P2. Students will investigate magnets
and how they affect other magnets and
common objects.
a. Investigate to find common objects that
are attracted to magnets.
b. Investigate how magnets attract and
repel each other.
• A magnet is any object that pulls certain
metals towards it.
• Magnets attract, or pull metals towards them.
• A magnet will attract an object that has iron,
cobalt, steel or nickel in it.
• All About Magnets
• Magnets BrainPopJr.
The ability of a magnet to attract metals
is called magnetism.
Do you think Rubber, paper, wood, glass
and plastic would be attracted to a
magnet? Why or Why not?
Lets see what happens when
we try….
• There are two kinds of magnets:
• A permanent magnet is an object that keeps
its magnetism for a long time.
• Can you think of any magnets in your house
that are permanent magnets?
• Did you know that some rocks are permanent
magnets?
• By far the most important magnetic rocks are
those containing magnetite.
Magnetite occurs in a range of rocks,
including sandstones, granites and
metamorphic rocks.
• Magnetic Rock called Hematite
• Magnetic Rock called Lodestone
• It is found near or at the Earth’s
surface
• A Temporary Magnet is an object that
loses its magnetism after a short time.
• Some metal objects can be made into a
magnet.
• A paper clip can be made into a
temporary magnet buy rubbing it with a
magnet.
• It will then be able to attract other
metal objects like staples.
• When you look at a magnet most of the
metals that are sticking to the magnet
stick to the ends of the magnet.
• The ends of the magnet are called the
magnetic poles.
• The magnetic poles are the areas of the
magnet where the force of attraction is
the strongest.
• Lets test and see!!
• All magnets have a north and south pole.
• If you were to tie a string around the
middle of the magnet and pick up the
string what do you thinks would happen?
• If you hold a magnet by the string the
magnet will start to turn slowly.
• It will turn until one of its ends points
north and one end point turns south.
• Lets try!!!
• A magnet has a magnetic field around it.
It will attract iron and nickel objects
that are in its magnetic field.
• Let me demonstrate…..
• Earth is like a huge magnet. It has poles
and a magnetic field.
• What is a magnetic field?
• A magnetic field is the space around a
magnet where the force of the magnet
can act. A force is a push or pull.
• A magnetic field is invisible. You cannot
see it.
• Magnetic Poles
• When two magnets are close together
they affect each other.
• They can pull towards each other or
rebel each other.
• When two poles are the opposite they
will attract each other.
• When two poles are the same they will
repel or push away from one another.
• Let’s try!!
• The center of the Earth is made mostly
of melted iron.
• This iron gets magnetized when the
Earth Spins so Earth acts like a giant
magnet!
• Earth has two magnetic poles. It has a
north and South magnetic pole.
• Earth also has a magnetic field that
surrounds it.
• Have you ever been lost?
• What is an instrument that can help
you know what direction you are
traveling in?
• A compass is a device that is uses a
free moving magnet needle to show
direction.
• A compass helps you know in which
direction you are going.
• A compass works because of Earths
magnetic poles. One end of needle is
always attracted to Earth’s magnetic
North Pole.