Topic / Title
Newton’s First Law of Motion: Law of Inertia
Grade Level
Grade 8
Time Allotment
1 Hour and 30 minutes--*
Performance Standard
The learner shall be able to:
Develop a written plan and implement a Newton‘s Olympics
Learning Competency
The Learners should be able to:
Investigate the relationship between the amount of force applied and the mass of the object to the amount of
change in the object‘s motion (S8FE-Ia-15)
Objectives:
1. Describe what happens to an object when an external force is introduced in its current state.
2. Define inertia.
3. Infer the relationship between inertia and the mass of an object.
4. Appreciate the importance of Newton’s First Law of Motion.
ELICIT (3 minutes)
EXPECTED STUDENTS’ RESPONSE
MATERIALS




Ask the students who among them are familiar with
“The Lazy Song” by Bruno Mars.
Play the song and encourage them to sing with the
tune.
Let the students share their insights about the
song.
Ask the question: What message does the song
convey?
Mp4 song/music
video, Zoom App

The song conveys that the
singer is lazy or sluggish.
ENGAGE (5 minutes)
Use the song’s main thought to relate to the topic
of inertia.
PowerPoint
presentation,
Zoom App
Introduce the idea that some people use the word
“inertia” to refer to an emotional state.
 The word inertia comes from the Latin
word iners which means “idle.”
EXPLORE & EXPLAIN (35 minutes)
Let the learners perform activities 1 and 2: “Leaving Me
behind When You Go.” The learners execute the activity
by following the procedures while being guided by the
teacher through modeling.
PowerPoint
presentation of
the activity
procedures and
materials
needed. Zoom
App
Ask them to answer the Guide Questions.
GUIDE QUESTIONS:
A. What happened to the egg when the pie pan has
been quickly pushed?
 The egg dropped inside the glass of
B. What do you think is the reason for your
observation?
 The egg resisted the change in its
water.
motion because of its inertia.
C. What happened to the bottles when applied with
identical forces through slightly kicking? Compare
each bottle. (Activity 2)
D. Compare the two bottles based on their masses.
Prepared by:
Joyce Ann B. Dalungan
Teacher III
 The bottles covered different
distances from their origin when
slightly kicked.
 The empty bottle is lighter while the
E. Which has more inertia? The empty bottle or the
bottle filled with water?
one filled with water is heavier.
 The bottle filled with water
possesses greater inertia.
F. From that simple activity, what can you infer
regarding the relationship of mass and inertia?
 The greater the mass of an object,
the greater is its inertia.
G. Which is harder to move, an empty grocery cart or a
cart full of grocery items? Why?
 The cart full of grocery items is
harder to move because of its
heavy weight; That means it
possesses greater inertia and
would likely to resist the force
introduced through pushing than
the empty cart.
H. Define inertia operationally.
 Inertia is the tendency offered by a
body to resist any change in its
state of rest or motion.
EXTEND (10 minutes)
Ponder on these situations and justify.
 You are riding on a jeepney to
your school. Along the way, you
are comfortably seated when
suddenly the jeepney driver steps
on the brakes because a dog
crossed the street. As a result, you
tend to be thrown forward. What
explains this phenomenon? Why?
 In the school quadrangle during
your PE class, you are playing
“luksong
tinik”
with
your
classmates. Infer why you often
run from a distance before taking
the jump?
Administer a short game quiz “Draw Me Luck” to
boost and energize the students while enhancing
retention of learnings.
1. Which has the greatest inertia among
the following?
a. Pinch of Salt
b. Belt
c. Handkerchief
d. Narra bed
2. Which has the tendency to be moved
easily among the following?
a. Pinch of Salt
b. Belt
c. Handkerchief
d. Narra bed
3. Which has greater inertia?
1kg of Cotton or 1kg of Nails
Prepared by:
Joyce Ann B. Dalungan
Teacher III
 The passenger remains in the state
of motion due to its inertia. This is
the reason for the passenger to
lean forward when the bus stops
suddenly.
 The reason why you run before
taking a long jump is that you are
bringing yourself in the state of
motion and so it becomes easier for
you to hurdle the “luksong tinik.”
PowerPoint
Presentation,
Zoom App
The Hat (Offline
Draw App)
 D

A

SAME
EVALUATION (7 minutes)
Conduct a short quiz.
1.What is Newton’s First Law of Motion?
 Law of inertia
2. This is the tendency of an object to resist
changes in motion.
 Inertia
3. The quantity that is considered as a
measure of a body’s inertia.
 Mass
4. Which of these has greater inertia: A
motorcycle or a 10-wheeler truck?
 10-wheeler truck
5. Compared to 8 kg of feathers, what can you
say about the inertia of a 6 kg iron?
 Inertia of lead is lesser than the
feather.
6 – 7. two kinds of inertia
 Inertia at rest & Inertia in motion
8-10. State the first law of motion/law of inertia.
 An object at rest remains at rest
and an object in motion remains
in motion unless acted upon by
external force.
Prepared by:
Joyce Ann B. Dalungan
Teacher III
PowerPoint
Presentation,
Zoom App
ACTIVITY SHEET
Name: ______________________________________
TOPIC: INERTIA
ACTIVITY 1: LEAVING ME BEHIND WHEN YOU GO
The word “inertia” is often used to refer to an emotional state. When people say that they have lots
of inertia, they mean that they feel sluggish, and they have difficulty in getting themselves moving. The
word inertia comes from the Latin word iners which means “idle.”
OBJECTIVES: At the end of the activity, you should be able to:
Investigate the relationship between the amount of force applied and the mass of the object to the
amount of change in the object‘s motion (S8FE-Ia-15)
 Describe what happens to an object when an external force is introduced in its current state.
 Define inertia.
 Infer the relationship between inertia and the mass of an object
 Appreciate the importance of Newton’s First Law of Motion
MATERIALS: Cardboard tube, Pie pan, Eggs, Water, A large drinking glass, two 1.5 liters of soda plastic
bottle
PROCEDURES:
1.
Perform the initial activity with the following
procedures:
 Fill the large drinking glass about three-quarters
https://www.google.com/search?q=egg+drop+experiment+in+inertia&source=lnms&tbm=isch&sa=X
full with water.
&ved=0ahUKEwieNC9h6XbAhUMppQKHbvxDtUQ_AUICigB&biw=1366&bih=662#imgrc=amYo
gQSASsQNoM:
 Center a pie pan on top of the glass.
 Place the cardboard tube on the pie plate, positioning it directly over the water.
 Carefully set the egg on top of the cardboard tube. With your writing hand, smack the edge of the
pie pan horizontally. Don't swing up, and don't swing down! It’s important that you hit the pie pan
horizontally and use a pretty solid hit, so plan on chasing the plate and tube.
 Observe what happens.
GUIDE QUESTIONS:
A. What happened to the egg when the pie pan has been quickly pushed?
_________________________________________________________________________________
_________________________________________________________________________________
______________________________________________________
B. What do you think is the reason for your observation?
_________________________________________________________________________________
_________________________________________________________________________________
______________________________________________________
Prepared by:
Joyce Ann B. Dalungan
Teacher III
3. Get the two plastic bottles. Keep the first bottle empty and the second bottle filled with water. Apply
identical forces by kicking each of the bottles. Observe what happens. (Note: Just slightly kick the bottles)
C. What happened to the bottles when applied with identical forces through kicking? Compare each
bottle.
_________________________________________________________________________________
_________________________________________________________________________________
D. Compare the two bottles based on their masses.
_________________________________________________________________________________
_________________________________________________________________________________
E. Which has more inertia? The empty bottle or the bottle filled with water?
_________________________________________________________________________________
_________________________________________________________________________________
CONCLUSION:
F. From that simple activity, what can you infer regarding the relationship of mass and inertia?
_________________________________________________________________________________
_________________________________________________________________________________
G. Which is harder to move, an empty grocery cart or a cart full of grocery items? Why?
_________________________________________________________________________________
_________________________________________________________________________________
H. Define inertia operationally.
_________________________________________________________________________________
_________________________________________________________________________________
Ponder on these situations and justify.

You are riding on a jeepney to your school. Along the way, you are comfortably seated when
suddenly the jeepney driver steps on the brakes because a dog crossed the street. As a result,
you tend to be thrown forward. What explains this phenomenon? Why?
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________

In the school quadrangle during your PE class, you are playing “luksong tinik” with your
classmates. Infer why you often run from a distance before taking the jump?
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
Prepared by:
Joyce Ann B. Dalungan
Teacher III