Magnetic Force Grdae 4

Magnets have an
invincible magnetic field.

Magnets will not attract
all kinds of metals. Only
objects made of iron,
cobalt and nickel will be
attracted to magnets.
There are several types of
magnets like ring
magnets,
rectangular magnets,
horseshoe magnets and
bar magnets.
The ends of the magnets are
called poles. One pole is
called north pole (N), the
other is south pole (S). A
magnet has always both
north pole and south pole
though you break it.
Activity 1: Hook me up!
1. To make a fishing rod, tie the magnet to one
end of a yarn and tie the small stick on the
other end of the yarn.
2. Place the materials inside a box.
3. Fish out the materials one by one using the
suspended magnet tied at the end of the yarn.
4. List down the materials attracted by the
magnet.
5. List down the materials which cannot be
attracted by the magnet.
1. What material/s is/are attracted by
the magnet? What are these materials
made of?
2. What material/s is/are not
attracted by the magnet? What are
these materials made of?
3. What does this mean about the
materials attracted or not attracted to
magnets?
Activity 3: The Floating Paper Clip
Trick
1. Make your own floating paper clip
by clamping a bar magnet vertically.
2. Tie a paper clip to a thread and
tape the other end of the thread to the
base of the stand, such that the clip
is still help up by the magnet, but
leaving a gap between the two.
3. Repeat Step 2 but with both south
poles of the bar magnets
facing each other. Observe what happens
as you try moving one magnet closer to
the other magnet.
4. Repeat Step 2 with the north pole and
the south pole of the bar magnets facing
each other. Observe what happens as you
try moving one magnet closer to the other
magnet.
1. What happened to the magnets when
similar poles were brought closer to each
other?

dissimilar poles were brought closer to
each other?
3. What general statement can be

formulated?
similar poles were brought closer to each
other?

dissimilar poles were brought closer to
each other?
3. What general statement can be

formulated?
When the poles of the two
magnets are placed near each
other, they have a force that
will either pull them together
or push them apart. The push
and pull of a magnet is called
the magnetic force.
If the poles of a magnet are the
same and placed near each
other, then they will be
pushed away or will repel each
other. Either both south poles
or both north poles will result
to repulsion (like poles repel).
● If the poles of a magnet are
different and placed near each
other, then they will be pulled
together or will attract each
other.
Choose the letter of the correct
answer.
7. Which of the following
cannot be attracted by
magnets?
a. cobalt b. gold
c. Iron d. nickel
8. Which of the following can
be attracted by magnets?
a. nickel coin
b. copper wire
c. gold bar
d. aluminum pole
9. Earth is considered as a giant
magnet. How is Earth’s magnetic
field similar to that of a magnet?
a. It is made in Earth’s core.
b. It is shaped like a horseshoe.
c. It has North and South poles.
d. It is hundreds of kilometers
long.
10. Which of the following statements
is TRUE?
a. All magnets have two north poles.

b. All magnets have two south poles.
c. Magnets can attract an object made
of paper.
d. Most objects with iron are attracted
to magnets.
11. When the same poles of two
magnets whether North or South
are placed to each other, they _______.
a. do not move.
b. pull each other.
c. touch each other.
d. are not attracted to each
other.
12. What substance is
attracted to a magnet?
a. iron
b. lead
c. silver
d. water
13. What happens when
opposite poles of two magnets
are place near each other?
a. They do not move.

b. They break each other.
c. They push each other.
d. They attract each other.
14. If you break a magnet into
pieces, what will happen to the
force that will be exerted by the
magnet when in use?
a. Force will be doubled.
b. Force remains the same.
c. Force exerted will decrease.
d. Force of each magnet will not
be affected.
15. Which of the following is NOT true
about magnetic force?
a. Like poles of two magnets repel
each other.
b. The force of attraction is greater at
the middle.
c. Opposite poles of two magnets
attract each other.
d. Magnets attract objects made up of
iron, cobalt and nickel.

Magnetic Force Grdae 4

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Magnets have an

invincible magnetic field.

2. What happened to the magnets when

3. What general statement can be

2. What happened to the magnets when

3. What general statement can be

a. All magnets have two north poles.

a. They do not move.

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