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Magnet
- Natural - dug from earth's
crust known as lodestone
- Made of magnetite which
is a form of iron ore.
- Made of magnetite which
is a form of iron ore.
- Man-Made (Artificial)
- Is an object made of magnetic material. A
magnetic substance can be made into a magnet
- Can pull other objects made of
iron or steel
- Points in a North-South direction
- A magnet exerts pulling force - magnetic force.
Strongest part of magnet is at the ends of the
magnet known as poles.
- Whatever shapes of magnet,
still have north and south poles
- Shapes, Horseshoe,
U-shaped, Rod, Bar, Ring,
Button
- Shapes, Horseshoe,
U-shaped, Rod, Bar, Ring,
Button
- Poles of magnet - N-Pole or S-Pole
- Like poles - N-Pole & N-Pole
OR S-Pole & S-Pole. They
repel each other
- Unlike poles - N-pole & S-pole.
They attract each other
- Like poles - N-Pole & N-Pole
OR S-Pole & S-Pole. They
repel each other
- Whatever shapes of magnet,
still have north and south poles
- Magnetic Force - can pass through non
magnetic object such as glass, paper, plastic and water
- Strongest at its poles and
weakest at the centre of
magnet
- Strength depends on : 1) distance between
the magnet and object; 2) how magnetic the
magnet is; 3) weight of object.
- Magnet force, is felt outside the magnet - called magnetic field
- Strongest at its poles and
weakest at the centre of
magnet
- Strength of Magnets
- Made of iron or steel
are not strong
- Made of steel or mixtures of cobalt
and nickel do not lose magnetism
easily. Known as permanent
magnets
- Made of Iron tend to lose
magnetism easily
- Made of iron or steel
are not strong
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