Transcript Magnets.ppsx - Western Beaver County School District

Topic: Magnets and Magnetism
PSSA: 3.4.7.C / S8.C.2.1
Objective:
 TLW describe the properties of
magnets.
 TLW explain why some materials are
magnetic and others are not.
 TLW explain the effect of the Earth’s
magnetic field.
MI #1: What are Magnets?
 A magnet is any material that attracts
iron or materials containing iron.
 Magnets have two poles, the north pole
and the south pole; opposite poles
attract
 If hung from a string a bar magnet will
rotate so that its north pole is pointing
north.
MI #2: Magnetic Fields
 A magnetic field is the region around a
magnet where the magnetic forces act.
 Magnetic force is the force of attraction
and repulsion generated by moving or
spinning electric charges.
MI #3: What causes magnetism?
 Magnetism is caused by the
arrangement of atoms in elements such
as iron, nickel, and cobalt.
 The areas where the atoms in these
elements arrange themselves are called
domains.
MI #4: Kinds of Magnets
 Ferromagnets are magnets made of
iron, nickel, or cobalt, or of alloys of
these elements.
 Electromagnets are magnets that are
made with an electric current.
MI #5: Earth as a magnet
 Earth behaves as if it has a giant bar
magnet running through it
 A compass points north because it is
magnetically attracted to the magnetic
pole in the north.
So What…? Real Life Application
 Understanding magnets is important
because the relationship between
magnets and electricity is used to
power many of the machines we have
today.