St. Paul University Philippines
Tuguegarao City, Cagayan 3500
1
Teaching and Learning Modules in Grade 9 Science
____________________
A Paper
Presented to the Faculty of the
Graduate School of
St. Paul University Philippines
Tuguegarao City
Cagayan Philippines
_____________________
A Terminal Output for the Course,
SCI207: GRADUATE SEMINAR IN GENERAL SCIENCE
___________
by:
MARIA PIA W. SIBAYAN
Third Trimester 2021-2022
Graduate School
St. Paul University Philippines
Tuguegarao City, Cagayan 3500
2
LEARNING MODULE
Impulse
Prepared by:
MARIA PIA W. SIBAYAN
Graduate School
St. Paul University Philippines
Tuguegarao City, Cagayan 3500
3
INTRODUCTION
This module was designed and written with you in mind. It is here to help you understand importance of
impulse to collision of objects. The scope of this module permits it to be used in many different learning situations.
The language used recognizes the diverse vocabulary level of students. The lessons are arranged to follow the
standard sequence of the course. But the order in which you read them can be changed to correspond with the
textbook you are now using.
The lesson is about impulse and its relationship to collision.
After going through this module, you are expected to:
1. Demonstrate the understanding of impulse
2. Solve problems involving momentum
3. Relate impulse to collision of object
Graduate School
St. Paul University Philippines
Tuguegarao City, Cagayan 3500
4
ENGAGE
ACTIVITY 1: REVIEW
From the concepts that you have learned last module, answer the check up questions:
1. Which has more momentum, a huge truck that is not moving or a small toy cart that is moving?
2. A moving car has momentum. If it moves twice as fast, its momentum would be __________ as
much.
3. Two cars, one twice as heavy as the other, moves down a hill at the same time. The heavier car
would have a ________________momentum.
ACTIVITY 2:
Study the pictures below and answer the question that follow.
Source: shutterstock.com. Karate Breaking Brick
Source: homeofficesports.com
Source: Vectorstock.com. Boy Playing baseball
Source:Distasiofirmco.com. Head-on-Colission
Guide Question: What affects the motions of the object? It is a five letter word. Guess it. ____
_____ ____ ____ ____
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EXPLORE
Great! Now you know that force affects the motion of objects. In the next activity, you will understand more on the
concept wherein you should control the force when you increase the time of impact.
Directions: Study the pictures below and answer the questions below.
“Airbag”
“Seatbelt”
Source:Philkotse.com
“Gear Shift”
Source:Cars.com
Source:Freepik.com
“Brakes”
Source:Atlantictireonline.com
1. What is use of the following:
“AIRBAG”_____________________________________________________________________________
___________________________________________________________
“SEATBELT”_____________________________________________________________________________
___________________________________________________________
“GEAR SHIFT”_____________________________________________________________________________
___________________________________________________________
“BRAKES”_____________________________________________________________________________
___________________________________________________________
When two vehicles collide, the force of impact is so great that causes damage to the
vehicles and risks the lives of the passengers. Small impact forces may only cause dents
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St. Paul University Philippines
Tuguegarao City, Cagayan 3500
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and slight injuries, but big forces could totally wreck the vehicles and possibly cause death.
Now let us study how large impact forces are brought about collision.
Changes in momentum happen every time. A fast-moving car when suddenly stopped
might have damaging effects not only to the vehicle itself but also to the person riding it.
Various devices have been installed in vehicles in order to ensure the safety of the
passengers. The use of seatbelts is even prescribed by law in order to lessen injuries from
car crashes. Inflatable airbags are also installed in most cars aimed to increase the time of impact
between the driver or passenger and the crashing vehicle in the event of an accident. Can you
think of some other safety devices installed on vehicles?
In physics, an external force acting on an object over a specific time leads to a change in
momentum of the object. A special name is given to the product of the force applied and the
time interval during which it acts: impulse.
Impulse = force x time
Do you still remember Newton’s Second Law of Motion? It states that the net force is
directly proportional to the mass of a body and its acceleration. In equation form,
F = ma
Since
𝑎 =𝑣𝑓−𝑣𝑖/𝑡 ,
then
F = m(vf– vi) / t .
Rearranging the equation will give you Ft = mvf – mvi
Since p = mv,
Ft = pf – pi
or
Ft = Δp
It turns out that the same impulse invariably leads to the same change in momentum. The
above equation implies that for a fixed value of the change in momentum, the impact force
is smaller when the impact time is bigger while the impact force is bigger when the impact
time is smaller. A quick jab by a boxer makes a hard hit. A net, a cushion and corrugated
containers all decrease the impact force.
From the equation, we can see that the product of force and time, which is impulse, equals
the change in momentum. Can you think of some other applications of impulse in our
everyday lives?
Sports like karate, taekwondo, baseball, golf and tennis utilize the concept of follow
through as an important strategy to obtain a greater momentum. When a tennis player hits
the ball, a follow-through keeps the tennis racket in contact with the ball for a longer time,
and so the ball experiences a greater change in momentum for the same force applied.
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St. Paul University Philippines
Tuguegarao City, Cagayan 3500
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Let’s try this:
Tiger Woods hits a 0.02 kg golf ball, giving it a speed of 25 m/s. What impulse does he
impart to the ball?
Given:
m = 0.02 kg
Δv = 25 m/s – 0 = 25 m/s
Find: I
Solution:
Since the golf ball is initially at rest, the initial velocity is equal to zero.
Thus, I = Δp = mΔv
= (0.02 kg)(25 m/s)
= 0.50 kg-m/s or 0.50 Ns
A football player kicks a ball with a force of 50N. Find the impulse on the ball if his foot stays
in contact with the football for 0.01s.
Given:
Solution:
F=50N
I=Ft
=(50N)(0.01s)
=0.5Ns
t=0.01s
A 0.5kg baseball experiences a 10N force for the duration of 0.1s. What is the change in
velocity of the baseball?
Given:
F=10N
m=0.5Kg
t=0.1s
V=?
Solution:
Ft=mv
therefore v=Ft/m
V=10Nx0.1s =2m/s
0.5Kg
EXPLAIN
MY LIFE PROTECTION
Directions: Below are the thing we use for our protection. In what way can those things
help you? Answer it in just one sentence.
1.
Source: https://www.vecteezy.com/vector-art/10817988-hanging-boxing-gloves
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St. Paul University Philippines
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2.
Source: https://www.rei.com/learn/expert-advice/running-shoes.html
3.
4.
Source: https://www.autoweek.com/gear/g40666929/best-motorcycle-helmetsmips-technology/
Source: https://abcnews.go.com/US/buffalo-shooting-renews-calls-body-armorregulation/story?id=85437343
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5.
Source: https://www.stockunlimited.com/vector-illustration/boxinghelmet_1808894.html
SOLVING TIME!
Directions: Solve for the following problems using the formula of impulse.
1. A volleyball player approached the ball with a force of 60 N. If he hits the ball in 0.2
second. How much impulse is imparted to the ball?
2. A hockey player applies an average force of 80N to a 0.25kg hockey puck for a time of
0.2s. Determine the impulse experienced by the hockey puck.
3. How much force is required to stop a 60 kg person traveling at 30 m/s during a time of
5s?
4. A lady tennis player hits a 0.002 kg tennis ball, giving a speed of 15 m/s. What impulse
does she impart to the ball?
5. A 5Kg football is thrown having a force of 15N s to the right. A stationary receiver
catches the ball and brings it to rest in 0.2s. what is the velocity of the ball when it was
thrown?
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St. Paul University Philippines
Tuguegarao City, Cagayan 3500
10
ELABORATE
SYNTHESIS:
THE BUS AND THE TRICYCLE
One Day a bus collides with a tricycle. Put a check if it applies with the situation and “x” if not.
____1. The bus and the truck have the same impulse.
____2. The tricycle experience more impulse that the bus.
____3. The bus has more force than the tricycle.
____4. The change of momentum of the tricycle is the same as its impulse.
____5. The impulse of the bus is greater than the tricycle.
DIFFERENTIATED ACTIVITY:
Direction: In this activity, you are going to choose only one (1) task that you can complete. After
completing the task, submit it to your teacher. Please refer to the rubrics as your guide. The content is
about safety tips/reducing the impact of vehicular accident.
1. Make a poem, 2 to 3 Stanza can do.
2. Make a poster
3. Write a letter
RUBRIC
Point
5
Content
The idea is logically
written and
expressed in a clear
manner.
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The idea is
appropriately
written and
expressed in a
clear manner.
3
2
Reasonably
written
and
expressed the
idea but too
simple and basic
Minimally
developed an
idea but was
not focused on
the topic
1
Answer does
not show any
knowledge of
the topic
St. Paul University Philippines
Tuguegarao City, Cagayan 3500
Craftmanship
work is neat,
displays
attractiveness,well
constructed and not
messy.
work is neat,
displays
attractiveness,
good
construction
and not very
messy
work is neat,
displays
attractiveness,
has
good
construction.
Creativity
It is exceptionally
creative and
exceptionally use of
new ideas and
originality.
It is creative and It is creative and
good use of new it use new ideas
ideas and
and originality.
originality
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Work
is Work is
acceptably
distractingly
attractive
messy.
though it may
be a bit messy
It is creative
and it has
slightly use of
new ideas and
originality
It does not
reflect any
degree of
creativity and
no use of new
ideas and
originality.
EVALUATE
Direction: Modified True or False. Write TRUE on the space provided before the number if
the statement is correct, but if it is false, change the underline word or group of words to make the
whole statement true.
_____1. Impulse is the force needed to produce a change in the body’s momentum through a
combination of changes in its mass and/or velocity.
_____2. An object which experiences a net impulse will definitely experience a momentum
change.
_____3. Two objects collide. Object A has greater mass and velocity while Object B has
smaller mass and velocity. In this case, Object B has greater change of momentum or impulse.
_____4. Sudden stops impart tremendous forces because the change in speed happens within a
shorter time.
_____5. Impact force is greater when the impact time is longer.
FORCE(N)
87
7._____
38
75
10._____
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COMPLETE THE TABLE
TIME(s)
MASS(Kg)
VELOCITY(m/s)
0.436
6.________
34.7
18.90
98.65
24.78
8._______
15
2.68
12.6
55.53
9._____
23.45
85.90
13.45
St. Paul University Philippines
Tuguegarao City, Cagayan 3500
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ANSWER KEY
1.TRUE
2. TRUE
3. OBJECT A
4. TRUE
5. SHORTER
REFERENCES:
6. 1.09
7. 129.34
8. 1.06
9. 17.02
10. 49.27
Alvarez, Liza A.,et al. Science9.Learner’s Module.Pasig City: Department
of Education. 2015.
Alvarez, Liza A.,et al. Science9.Teacher’s Guide. Pasig City: Department
of Education. 2015.
Bartolome, Floridel, Science 9 Quarter 4 module 3 “Impulse and Momentum”
Department of Education • Cordillera Administrative Region
Schools Division of Kalinga District of Rizal
Graduate School