Magnetism

2. The ancient Greeks knew as well as we do that
lodestone (an iron-rich mineral) could attract other
pieces of iron.
Magnesia
Lodestone

3. Magnetism is an invisible force. This force
pulls/attracts metal objects towards a magnet.
horseshoe
magnets
bar magnets
circular
magnets.
There are lots of different types of magnets (natural
or man-made).
Magnetite/
Lodestone

4. All magnets have two poles – a South pole and a
North pole.
North pole
South pole
North
pole
South
pole
North pole
South pole

5. Poles that are different attract each other. This
means the invisible magnetic force will pull the
poles together like this.

6. Poles that are the same do not attract each
other. These will repel. This means they will
push each other apart and will not touch or
attract each other at all.
Attract and repel are opposites.

7. Some metals are magnetic. Objects made of
these metals are attracted to a magnet. Just
because an object is made from metal does not
make it magnetic.
This can is made
from aluminium.
Will it be
attracted to the
magnet if we put
it underneath?
The aluminium can
is not attracted to
the magnet.
Aluminium is a
metal but it is not
magnetic.

8. Some metals are magnetic. Objects made of
these metals are attracted to a magnet. Just
because an object is made from metal does not
make it magnetic.
The nail is
attracted to the
magnet because
iron is a magnetic
metal.
This nail is made
from iron. Will
this be attracted
to the magnet if
we put it
underneath?

9. Let’s look at some other objects. Can you guess
which ones will be magnetic?
This knife is
made of
steel, which
is magnetic.
The pencil is
not made from
a magnetic
material .
This ball is
made of
rubber and is
not magnetic.
The screw is
made from
iron, just like
the nail.

10. Are all magnets the same shape?
No. There are lots of
different types. Here
are some of them.
horseshoe
magnets,
bar magnets
and…
circular
magnets.

11. What do all magnets have?
All magnets
have a North
pole and a
South pole.
South pole
North pole

12. What do different poles do ?
Different
poles attract.

13. What do poles that are the same do ?
Poles that are
the same
repel.

14. Are all metals magnetic ?
No. Only some metals
are magnetic
Aluminium is not
magnetic.
Iron, steel, nikel…
are magnetics.

15. 4 things to know about magnet!!!!!
1. A magnet creates an invisible area of magnetism all
around it called a magnetic field.
2. The north pole of a magnet points roughly toward
Earth's north pole and vice-versa. That's because Earth
itself contains magnetic materials and behaves like a
gigantic magnet.
3. If you cut a bar magnet in half. You get two brand new,
smaller magnets, each with its own north and south
pole.
4. If you run a magnet a few times over an unmagnified
piece of a magnetic material (such as an iron nail), you
can convert it into a magnet as well. This is
called magnetizationmagnetization..

16. Magnetic field
Invisible area AROUND the magnet where it can
attract a magnetic metal (apply its force). Outside it
this force disappears.
The magnetic field is stronger at the poles.

17. THE EARTH IS A HUGE MAGNET
The Earth’s
molten iron core
acts like huge
magnet
The magnetic north pole is not the same
than the geographical North Pole.
GEOGRAPHICAL
NORTH POLE MAGNETIC
NORTH POLE

18. COMPASS
Navigational instrument used in unknown terrains or
when the visibility is poor, made up of:
Magnetised
Needle
(point the
magnetic north
pole)
The rose: circle
around the
needle marked
with the cardinal
points
(N,S,W and E)

19. https://www.youtube.com/watch?v=_ygmHnjNYNo
ELECTROMAGNETS
Are objects that ACT like magnets when an
electrical current passes through them.
So the magnet is ONLY activated by electricity.
If you switch off the electrical current the
magnet stop working