Magnet
An object that pulls certain metals
towards it.
Magnets
• A magnet has a force.
• A force is a push or a pull.
Magnetism
Magnetism is a force that makes a magnet able to push or pull another object
Types of Metals that are attracted…INCS
I.N.C.S.Iron
NickelCobaltSteel
A rock…magnetic?.
lodestone is a rock that occurs in nature
and is magnetic
Magnetic Field
space around a magnet where the
force of the magnet can still work.
Magnetic FieldImage From: http://www.bbc.co.uk/schools/ks3bitesize/science/images/magnetic_fields.gif
Magnetic Poles.
areas of the magnet where a magnet’s attraction is the
strongest
North and South
Magnets have two ends, they are also called poles. The poles are named North and South.
Attract
•A magnet attracts certain metals
Attract
To Pull TogetherS N S N
Repel
To push apartS N N S
2 Types of Magnets
.
• Temporary Magnet – an object that loses its
magnetism after a short time
• Permanent Magnet- an object that keeps its
magnetism for a long time
Compasses
This device
shows direction
Compasses
A compass works because Earth is surrounded by a magnetic field.
Compasses
North on a compass is attracted to
Earth’s Magnet
Magnets are Everywhere
RefrigeratorsCars
Heavy machinery
North and South
N
N S S
Repel or Attract
S N N S
S N S N
Rep
el
Attract
Different Kinds of Magnets
N
N S S
Bar Magnet
Hor
sesh
oe
Mag
net
Review (What kind of magnets are these?
N
N S S
Bar Magnet
Hor
sesh
oe
Mag
net
Earth is a Magnet
•Earth is like a magnet because it has melted iron (molten)deep inside
Earth is a giant bar magnet
Earth’s Magnetic Field
Image From: http://oceanexplorer.noaa.gov/explorations/05galapagos/logs/dec22/media/magfield_600.gif
Review
Magnets have 2 _______.
What 4 types of metals do magnets attract?
iron, nickel, cobalt, and steel
poles
Magnets attract _____________.metals
Review
Where are some places you can find magnets?
How does a compass work?The magnet on the compass is attracted to Earth’s magnet
refrigerators, can openers, machinery, etc
Earth is like a giant __________.magnet
Review
To pull together is to ______.
Can 2 like poles pull together?No
attract
To push apart is to ______.repel
Review
Can two opposite poles pull together?
What are the end points on a magnet called?
poles
yes
Why is the earth like a giant magnet?is has melted iron inside
Review
What is molten?
Where is a magnet the strongest?at its poles
melted iron
Which object is not magnetic? steel nail, iron lock, plastic glass
plastic glass
Review
Why does a compass always point north?
What is the name of a magnetic rock?lodestone
because its magnetic needle is attracted by the magnetic force given off by Earth’s North Pole
What do we call magnets that lose their magnetism after a short time?
temporary magnet