4

Science
Quarter 3 – Module 2 :
Magnetic Force
Science – Grade 4
Alternative Delivery Mode
Quarter 2 – Module 2: Magnetic Force
First Edition, 2020

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 4

Science
Quarter 3 – Module 2 :
Magnetic Force
Introductory Message
This Self-Learning Module (SLM) is prepared so that you, our dear learners,
can continue your studies and learn while at home. Activities, questions, directions,
exercises, and discussions are carefully stated for you to understand each lesson.

Each SLM is composed of different parts. Each part shall guide you step-by-
step as you discover and understand the lesson prepared for you.

Pre-tests are provided to measure your prior knowledge on lessons in each

SLM. This will tell you if you need to proceed on completing this module or if you
need to ask your facilitator or your teacher’s assistance for better understanding of
the lesson. At the end of each module, you need to answer the post-test to self-check
your learning. Answer keys are provided for each activity and test. We trust that you
will be honest in using these.

In addition to the material in the main text, Notes to the Teacher are also
provided to our facilitators and parents for strategies and reminders on how they can
best help you on your home-based learning.

Please use this module with care. Do not put unnecessary marks on any part
of this SLM. Use a separate sheet of paper in answering the exercises and tests. And
read the instructions carefully before performing each task.

If you have any questions in using this SLM or any difficulty in answering the
tasks in this module, do not hesitate to consult your teacher or facilitator.

Thank you.
 What I Need to Know

This module is written and designed for the learners to have a broader and
deeper understanding about magnetism and the force exerted by a magnet.
At the end of this module, the learners are expected to learn about the…
Content Standard: force that can change the shape, size, or movement of
objects.
Learning Competency: characterize magnetic force (S4FE-IIId-e-3)

What I Know

Read and analyze. Write the letter of the correct answer on the blank before each
number.

______1. This is a push or pull, which occurs when two or more objects interact with
each other.
a. Motion c. Magnetism
b. Force d. Gravity

_____ 2. It is the phenomenon in which an object changes its position over time.
a. motion c. Force
b. magnetism d. gravity

_____ 3. The following are ways to change the shape of an object EXCEPT__________
a. bending c. pounding
b. staring d. twisting

_____ 4. What do you call the force that works against the movement of two objects?
a. friction c. magnetism
b. gravity d. motion

_____ 5. What are the forces acting on the shopping cart when a woman pushes it?
a. unbalanced forces c. inertia
b. friction d. balanced forces

_____ 6. How would you know if an object has changed position?

a. It is on top of a reference point.
b. It is farther or closer from a reference point.
c. It looks bigger.
d. It is not visible anymore.

_____ 7. A boy found a big rock blocking on the pathway. What type of force he can
use to move it?
a. gravity c. magnetic
b. push and pull d. friction
_____ 8. What instrument that you use only the force of pull to make a sound?
a. drums c. accordion
b. guitar d. bandurya

_____ 9. Which of the following object would require a greater force to move?
a. pencil c. bookshelf
b. book d. eraser

_____ 10. Which of the following object will require a lesser force to move?
a. refrigerator c. closet
b. cabinet d. chair

Lesson

1 Magnetism

When we were younger, many of us have

experienced how to play a toy car, boats,
robots, or even toy airplane with a remote
controller. But have we ever wondered what
is inside it and how it works? Aside from the
battery, those toys also have a magnet inside that help
them to work and function effectively.

What’s In

Read each sentence carefully. Choose the letter of the correct answer.

1. How can you change the size of a rubber band?

a. by bending b. by stretching c. by pressing
2. Which of the following shows that an object changed its shape?
a. pushing a car b. pulling a box c. squeezing a sponge
3. The following statements affect the movement of an object EXCEPT one.
a. A girl molding a clay.
b. A boy pushing his toy car.
c. Children playing soccer.
4. When we applied __________ to an object, its size, shape, and movement may
change.
a. balance b. force c. gravity
5. Which of the following objects may change its size when a force applied to it?
a. dropping a flower vase c. pushing a cart
b. throwing a stone
 What’s New

Look at the pictures below. Put a connecting line on the objects that you think would
attract to a magnet.

What is It

Can you tell why these materials get attracted to a magnet? What are they
made of? Why are the other materials not get attracted to a magnet?

Magnetism is the force that acts on objects made of nickel, iron, and cobalt
and makes them move.

Example of objects that attract to a magnet. These magnets are metal. They
are also called magnetic objects.

nail paper clip needle

key scissors
 Examples of objects that are not attracted to a magnet. These objects are
non-metal because they are made up of wood, rubber, paper, glass, and plastic.
pencil slippers drinking glass

paper plastic bottle

Remember these:
❖ Magnets are objects that can attract other objects made up of iron, nickel,
and cobalt such as nails, metal spoons, paper clips, thumbtacks.
❖ It has an invisible magnetic field.
❖ Materials that are non-metals are not attracted to a magnet such as rubber,
plastics, and woods.
❖ There are several types of magnet like a rectangular magnet, a bar magnet,
ring magnet, and horseshoe magnet.

Types of Magnet

Rectangular Magnet Bar Magnet

Ring Magnet Horseshoe Magnet

 What I Can Do

Read the story and answer the questions that follow.

One Saturday morning, Claire was doing her homework on Home Economics
subject about the different types of stitches. It was very hard for her to hold the
needles because she might get stabbed by it, so she asked for the assistance of her
mother. Claire’s mother is a dressmaker. That is why it was easy for her to assist
Claire with stitches. Mother asked her to buy more needles at the store. Claire went
back home holding the needles and when she entered the door, she accidentally
dropped the needles on the floor. There were so many needles scattered on the floor
and she was having difficulties in picking them up.

Questions:
1. What Claire did one Saturday morning?
2. What did her mother tell her to buy?
3. If you were Claire, what will you do to pick all the needles easily?

Assessment

Color the red if the statement is correct and blue if it is not.

1. Magnets can attract objects made of wood.

2. Not all magnets have a magnetic field.
3. A horseshoe magnet is a type of magnet.
4. A metal spoon is an example of a magnetic object.
5. Magnets can attract all materials.
6. Magnetism is the force that acts on objects made of nickel, iron, and cobalt.
7. Non – metal materials are not get attracted to a magnet.
8. A needle is a non – metal material.
9. Magnetic objects will attract to a magnet even if they are far from it.
10. Some of our appliances have a magnet in it.
Lesson

2 Force Exerted by a Magnet

What’s In

Draw a happy face if the object will attract to a magnet and sad
face if not.

_____ 1. _____ 6.

_____ 2. _____ 7.

_____ 3. _____ 8.

_____ 4. _____ 9.

_____ 5. _____ 10.

 What’s New

Let us do the following:

1. Place 2 bar magnets on the

table.

2. Put the north pole of the

bar magnet to the north
pole of the other bar
magnet. Observe what
happens.

3. Put the south pole of the bar magnet to

the south pole of the other bar magnet.
Observe what happens. Illustrate your
observation.

4. Now, put the north pole of the bar

magnet to the south pole of the
other bar magnet. Observe what
happens. Illustrate your
observation.

5. Try to move the north pole of a bar magnet towards the south pole of the
other bar magnet.

Questions:

1. What happens when the same poles of a magnets face each other?
2. What happens when the opposite poles of a magnets face each other?
 What is It

The force exerted by a magnet on a certain material is either push or pull, it is

called magnetic force. The force exerted by it is invisible. Magnets may differ in sizes
and shapes, but they all have the same properties. Look at the picture below.

As you can see, most of the iron filings stick to the magnet. The place where the
magnetic force of a magnet is strongest is at its ends. These ends are what we call
the poles. All magnets have two poles, N stands for north pole and S for the south
pole. When the same pole face near each other, they will repel or push each other
away. When the opposite pole face near each other, they will attract or pull each
other together.

See illustrations below the attraction and repulsion of a magnet.

Attraction of Two Magnets

Repulsion of Two Magnets

Remember:

❖ The force exerted by a magnet is either push or pull or what we call magnetic
force.
❖ Magnets have two poles, the north pole, and the south pole.
❖ When the poles of two magnets place near each other, it has a force that will
pull them together or push them apart.
❖ When the same poles of two magnets place near each other, they repel or
push each other away.
❖ When the opposite poles of two magnets place near each other, they attract
or pull each other together.
❖ If you break a magnet, the force that will be exerted by it will decrease.
❖ The push and pull of a magnet are called magnetism.
❖ We can use iron filings to illustrate the magnetic field of a magnet.
❖ Most of our appliances have a magnet inside them like television, radio,
refrigerator, and electric fan.

What’s More

Write TRUE if the statement is correct and FALSE if it is wrong.

__________ 1. All magnets have only one pole.

__________ 2. If you break a magnet into pieces, the force exerted by it will
decrease.
__________ 3. Most objects with iron and nickel are attracted to a magnet.
__________ 4. Magnet can repel an object made of wood.
__________ 5. Magnet can attract an object made of stainless steel.
__________ 6. When the magnets with the same poles face each other, they will
pull apart or repel.
__________ 7. We can use iron filings to see the magnetic field of a magnet.
__________ 8. The force exerted by a magnet is push only.
__________ 9. Most of our appliances like television and radio have magnets.
__________ 10. Magnets are not important in our daily lives.
 Assessment

Choose the letter of the correct answer.

1. Magnets have force that attracts materials made of _______________.
a. copper c. plastic
b. wood d. iron

2. When two magnets attract, they _______________.

a. pull together c. break
b. change color d. push apart

3. When two magnets repel, they _______________.

a. break c. push apart
b. pull together d. change color

4. Magnets have two ends, the north and south _______________.

a. region c. pole
b. color d. corner

5. When magnets are ____________________ the force of magnetism is stronger.

a. farther apart c. round
b. rectangular d. closer together

6. If you break a magnet into pieces, the force exerted by it will _______________.
a. stay the same c. increase
b. decrease d. get stronger

7. Magnets have invisible ____________________.

a. magnetic field c. sound waves
b. electric current d. signals

8. The place where magnetic force of a magnet is strongest is at its

_______________.
a. ends c. sides
b. edge d. all parts

9. The force exerted by a magnet is _________________________.

a. push only c. push and pull
b. pull only d. no force

10. All magnets have the same ____________________.

a. colors c. sizes
b. properties d. shapes
References
Abutay, Lelani, Dinah Bonao, Editha Crucis, Jimmie Eslabra, Ester Gramaje,
Michelle Guadamor, and Aniano Hernandez et al. 2015. Science Learner's
Materials. 1st ed. Reprint, 5th Floor Mabini Building, DepEd Complex Meralco
Avenue,Pasig City: Lexicon Press INC.

Abutay, Lelani, Dinah Bonao, Editha Crucis, Jimmie Eslabra, Ester Gramaje,
Michelle Guadamor, and Aniano Hernandez et al. 2015. Teachers Guide. 1st ed.
Reprint, 5th Floor Mabini Building, DepEd Complex Meralco Avenue,Pasig City:
Lexicon Press INC.

Bada, Marianne, and Rosalinda Cupcupin. 2016. Real-Life Science 4. Reprint, Abiva
Bldg., 851 G. Araneta Ave., Quezon City: Abiva Publishing House, Inc.

K to 12 Curriculum Guide in Science 4 page 55

MELC (Most Essential Learning Competencies) in Science 4 page 379

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Department of Education – Region III,

Schools Division of Bataan - Curriculum Implementation Division
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Telefax: (047) 237-2102

Email Address: bataan@deped.gov.ph