2. AFTER SEEING THIS PICTURE CAN
YOU UNDERSTAND WHAT ARE WE
GOING TO DO

3. FUN WITH MAGNETS

4. WHAT IS A MAGNET?
• Magnets are made of materials that attract
objects made of certain substances such as
iron , cobalt, and nickel.

5. DIFFERENT TYPES OF MAGNETS
• HORSESHOE MAGNET

6. • RING MAGNET

7. • CYLINDRICAL MAGNET

8. BAR MAGNET

9. POLES OF A BAR MAGNET
• When iron fillings are brought close to a
magnet, they do not stick evenly to all parts of
the magnet. The stick more on certain parts of
the magnet. These are called the poles of of
the magnet. These are, by convention, called
the NORTH POLE and the SOUTH POLE. The
two poles cannot exist independently. That
is, they always come in pairs. If we break a bar
magnet in the middle, we would get two
pieces,

10. each having a north pole and south pole.

11. REPULSION

12. REPULSION
• WHEN POLES (N-N) OR (S-S) ARE KEPT
TOGETHER THEY REPEL. THIS IS KNOWN AS
REPULSION.

13. ATTRACTION

14. ATTRACTION
• WHEN (N-S) ARE KEPT TOGETHER THEY
ATTRACT. THIS IS KNOWN AS ATTRACTION.

15. USES OF MAGNETS
• 1 ; Credit cards
• 2; Television and computer moniters
• 3; Computer hard discs and audio and video
cassettes.

16. LOSS OF MAGNETISIM
• A magnet can lose it’s magnetism when
• Someone throws it from a height
• Hitting with a hammer
• Applying heat