my very 1st demonstration.... @ 10-20-17

1. Some Basic Principles
of Magnetism
Demonstrator:
Lemuel B. Fenomeno

2. M A G N E T I S M

3. Objectives:
•Identify what are the properties
behind magnets.
•Gain evidence of magnetism through
simple experiment.
•To know the application of magnetism.

4. What is Magnetism?
• The force of attraction or repulsion of a
magnetic material.
• The study of magnetic fields and their
effect on materials.

5. What is a Magnet?
• A material which
exhibits
magnetism.

6. General Properties of Magnets
Magnets usually have
two poles:
- North Pole (North
Seeking Pole)
- South Pole (South
Seeking Pole)

8. Magnetic Field
• The outer
part of a
magnet
where forces
are acting
upon.

9. 2 TYPES OF MAGNETS
1. Permanent Magnets
•Objects that are artificially
magnetized
•Exhibits strong magnetic properties

10. Types of Permanent Magnets
Neodymium Iron Boron
Magnets
Alnico Magnets
Cerramic Magnets

11. 2. Temporary Magnets
•They are made by stroke and electric
methods.
•Loses their magnetic properties for a
short time
•Ex: paper clips, nails, thumbtacks, etc.

12. Activity 2
Testing for Evidence of Magnetism
Objectives:
• Identify the forces (attraction/repulsion)
between:
a. two magnets, and
b. a magnet and magnetic/nonmagnetic
materials.
• Distinguish a magnet (permanent or
temporary) from a non-magnetic object.

13. Materials:
• Pair of Magnets
• 6-10 objects made of different materials
from inside the room
Safety Precautions:
• Handle magnets with care so as not to drop
those. These might break, chip off, and
weaken upon impact.
• Keep magnets away from computer units
screen, memory storage, and the like.

14. Procedure:
Table 4. Interaction between two permanent magnets
What to do? What happened?
Place the magnets with
the same sides on the flat
horizontal surface .
Place the magnets with
different sides on the flat
horizontal surface.
The magnets exhibits
repulsion for they repel
each other.
The magnets exhibits
attraction for they attract
each other.

15. Table 5. Interaction of a magnet with other objects
What to do? What happened?
Mix the available objects
you have on a flat
surface then place a
magnet near them.
• The objects that
are made of
metals are
attracted to the
magnet.
• The remaining
objects are not
attracted to the
magnet.

16. Guide questions:
Q7. What conditions with observable effects make
magnets interact with another magnet?
Q8. In general, what conditions with observable
effects make magnets interact with non-magnetic
materials?
Magnets that are in good conditions are strong
enough to push or pull another magnet close
enough to it.
Magnets, strong or weak, can be made to attract
non-magnetic objects that is made of or has
parts that are magnetic in nature such as these
made of iron, nickel, cobalt or its alloys.

17. Q9. What type/s of forces can a magnet exert on
another magnet?
Q10. What type/s of force can a magnet exert on
non-magnet objects?
Magnets can both attract or repel other magnets.
Like poles of magnets when close enough will
cause the magnets to repel each other, while
unlike poles of magnets that are close will cause
the magnets to attract each other.
Both poles of the magnet can attract non-magnet
objects that have materials or parts that are
magnetic in nature.

18. Q11. How will you distinguish magnets from non-
magnetized magnetic materials?
Only magnets can repel other magnets and
already magnetized objects. But non-magnetized
objects made of magnetic materials can only be
attracted by a magnet.

19. Applications of Magnets
Used in giving directions
Used in storing information
Used in industries

20. Used by hospitals
Used for communications
Used at homes

21. Let’s Have a Quiz!
Multiple choice:
Direction: Write the letter of the correct answer.
(NRx1)
1. Any magnet has two ends, each one is called a:
a. Magnetic Field
b. Magnetic Pole
c. Magnetized Material
d. None of the Above

22. 2. A magnet made of material that keeps its
magnetism is known as:
a. Lifetime Magnet
b. Energizer Bunny Magnet
c. Permanent Magnet
d. Temporary Magnet
3. The lines that map out the magnetic field around
a magnet are:
a. Magnetic Field Lines
b. Magnetic Pole Lines
c. Magnetism
d. Magnet

23. 4. If two magnets were in this order: NS NS they
would:
a. Repel
b. Attract
c. Do nothing
d. None of these
5. If two magnets were in this order: NS SN they
would:
a. Repel
b. Attract
c. Do nothing
d. None of these

24. ANSWERS
1. b
2. c
3. a
4. b
5. a

26. Learning Resources:
• Science-Grade 10 Learners Materials, pp.93-94.
• Science-Grade 10 Teacher’s Guide, pp. 75-77.
• http:/www.worldofteaching.com
• http://physics.tutorvista.com/electricity-and-
magnetism.html
• www.tutorvista.com/physics/10-uses-of-
magnets?view=sample
• www.purplerail.com/partytrail/type-of-magnets/
• https://proprofs.com/quiz-
scholl/story.php?title=magnetism-quiz