Grade 8 Science q1w1 - Force Final Revised

Republic of the Philippines SCIENCE 8
DEPARTMENT OF EDUCATION Quarter 1 M 1

Region IX, Zamboanga Peninsula
SCHOOLS DIVISION OF ZAMBOANGA DEL SUR
Sapa Anding NHS- Ramon Magsaysay Extension
Name of Learner: ______________________________ Score:__________________

Section: __________________ Date: __________________
LEARNING ACTIVITY SHEET

Force and Motion
Introduction
In your Grade 7, you described the motion of
objects in terms of distance, displacement, speed,
velocity, and acceleration. As you remember,
distance is the total length of path travelled.
Displacement on the other hand is the shortest
distance the object makes with respect to the
reference point. In other words, distance is measured
by virtue of the object’s path, while displacement is
measured by virtue of the object’s final position
with the point of reference.
The time rate at which an object changes
Source: Grade 8 LM, 2013
distance is speed. Speed tells us how fast the object
is going. When the speed of the object is zero, it
means that the object is at rest. When the speed of an object has a magnitude equal to any
number, it means that the object is moving.
The time rate of change in displacement is velocity. Velocity describes how fast the
object changes position with respect to the reference point. Zero velocity may mean two
things. It may be that the object is at rest or it is moving but is located just right where the
reference point is at that instant of time! Just like when you are running around the oval or
making a U-turn and returned to the spot where you started.
Objects do not usually travel in uniform speed or uniform velocity. This means,
velocity changes over time. Objects usually speed up or slow down. Acceleration tells how
fast an object changes its velocity.
When the acceleration of the object is zero, it means that the object is in equilibrium
condition or a state of balance. In other words, the object may not be moving (static
equilibrium), or the object is moving at constant velocity (dynamic equilibrium). When this
equilibrium condition is disturbed, the object’s state motion is also disrupted. An object that
is initially at rest may now begin to move. Similarly, an object that is initially moving at
constant speed or constant velocity may speed up, may slow down, or may change direction.
In other words, the object accelerates.
What causes these changes in an object’s motion and how does it affect acceleration?
These are the things that we will investigate through this learning activity sheets.
Learning Competency with Code

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. (Quarter 1, Week 1, S8FE-Ia-15).
Learning Objectives:
1. Identify the forces acting on an object at rest.
2. Examine the conditions when two forces balance, and
3. Explain the effect of balanced forces on the state of motion of an object.
Activity 1 WORDSCAPE
Directions: Here are 10 words related to force and motion which are hidden in the box below.
Locate and encircle them.
Action
Push
Pull
Mass
Speed
Newton
Weight
Force
Friction
Velocity
Activity 2 FORCEVER CHAMP!

Directions: Have you experienced weight lifting or have you ever watched a weightlifting
game? Study the picture below and answer the questions that follow.
Source: https://images.app.goo.gl/oPdhisWmsfETWJKj7
Hidilyn Francisco Diaz a Filipina weightlifter and airwoman, the first Filipino gold
medalist during the 2020 Summer Olympics.
1. In a weightlifting game, what is exerted on the dumbbell as the player lifts it?
__________________________________________________________________________.
2. If the dumbbell is initially at rest, what is this force exerted by the ground surface to
the dumbbell?
__________________________________________________________________________.
3. What is the effect of this force to the dumbbell’s speed as the player lifts it?
__________________________________________________________________________.
Activity 3 MAY THE FORCE BE WITH YOU!
Directions: Examine the ball on the ground. Choose and encircle the letter of your answer to
the given conditions below.
A B C D
Source: https://clarkscience8.weebly.com/inertia.html
CONDITION ANSWER
1. In letter A, is the ball at A. Yes B. No
rest?
2. How can you make the A. The ball has to be B. The ball has to be
ball move? pushed or pulled. pulled only.
3. In letter B, what A. The ball moves in the B. The ball does not move.
happens to the ball when same direction as the
you push it with enough force.
force?
4. In letter C, while it is A. Exert a force opposite B. The ball has to be
moving, how can you the motion of the ball. pushed in the same
make the ball stop? direction of its motion.
5. In letter D, how can we A. The ball has to be B. The ball has to be
make the ball change its pushed sideways. pushed in the same
direction? direction of its motion.
Activity 4 BALANCED
Normally, there are more than one forces acting on an object. When two or more
forces act on an object, they add up algebraically to get the combined effect of the forces
called Resultant Force or Net Force.
Directions: A free-body diagram (FBD) illustrates the forces acting on an object to
determine the resultant force. Interpret the free-body diagrams below and answer the
questions that follow.
A. Tension
A pendulum is suspended at a certain height. The string exerts tension on the bob with
a force of 0.01 N. The weight of the bob is also 0.01 N.
String
F1 Tension = 0.01N
Pendulum bob
F2 Weight = 0.01N
1. What are the two forces acting on the bob? ______________________________________
2. Identify the direction of each force_____________________________________________
3. Using the Cartesian coordinate plane (x-y coordinate plane), determine the sign of an
upward force_____________________ and a downward force_________________________
4. With positive and negative signs affixed with the upward and downward forces,
respectively, add the two forces together. F net = F1 + F2
___________________________________________________________________________
5. If the Fnet on the pendulum is equal to zero, will the bob swing sideways? _____________,
will it move upward? _____________ , or move downward? ____________
6. Are the two forces acting on the pendulum balanced? ______________________________
7. What is the Fnet when forces are balanced? ____________________________________
B. Normal
A box weighing 20 N is placed on top of a table. The table supports the weight of the
box with an upward normal force of 20 N.
F1Normal = 20 N
Box
Table
F2Weight = 20 N
1. What are the two forces acting on the box? ______________________________________

2. Identify is the direction of each force? __________________________________________
3. Which force takes a positive sign? Up Down
4. How about the negative sign? Up Down
5. With positive and negative signs affixed with the upward and downward forces,
respectively, add the two forces together. F net = F1 + F2
___________________________________________________________________________
6. If the Fnet is equal to zero, will the box slide sideways? _____________________________
7. Are the two forces acting on the box balanced? ___________________________________
8. What makes the forces balanced? Describe their magnitude and direction.
___________________________________________________________________________
C. Friction
A load is pushed to the right along a horizontal floor with a force of 50 N. Static
friction acts towards the opposite direction with a frictional force of 50 N.
Load
Static Friction = 50 N F1= 50 N
Floor
1. What is the net force or resultant force, Fnet? ___________________________

2. Are the two forces acting on the load balanced? ________________________
3. Will the box move because of balanced forces? ________________________
Balanced forces on objects that are initially at rest illustrate the first fragment of
Newton’s First Law of Motion or the Law of Inertia.
Activity 5 UNBALANCED
Directions: Read and analyze the given situations and the free-body diagrams below.
Analyze the questions that follow and check the or write your answer on the space
provided.
A load initially at rest is pushed to the right along a horizontal floor with a force of 50
N. Starting friction acts towards the opposite direction with a frictional force of 20 N.
Load
Static Friction = 20 N F1= 50 N

Floor
1. What is the magnitude of the resultant force or Fnet? 30N -30N

2. Determine the direction of the net force. Right Left
3. Will the load move? Yes No
4. In what direction will the load move? Right Left
5. Are the forces balanced? ________________________________________________.
Directions: Complete the statement of Newton’s First Law of Motion or the Law of Inertia
Objects at rest will remain at rest. Object in motion will continue to __ __ __ __

in a __ __ __ __ __ __ __ __ line path with a __ __ __ __ __ __ __ __ speed, unless acted
upon by a net force or __ __ __ __ __ __ __ __ __ __ force.
Activity 6 MAY THE BEST FORCE WIN!
DIRECTIONS: Given the forces, draw FBD (Free-Body Diagram) in each figure to
illustrate the presence of force. Use the orange dot as the origin of the forces. Check the if
the object is at rest or in motion.
Fig. 1
Fig. 2
Fig. 3
Fig. 4
References:
Bacolod, R.O. & Cordova, E. B. (2020) . Science – Grade 8, Alternative Delivery Mode.
DEPARTMENT OF EDUCATION
Pasion, E. et al (2020). Learning Activity Sheets in Science. DEPARTMENT OF
EDUCATION, Regional Office No. 02 (Cagayan Valley). Regional Government Center,
Carig Sur, Tuguegarao City, 3500
Philippines. Department of Education. (2013). Learner’s Module. Science Grade 8 (First
Edition).
IMAGES
Figure 1 https://tinyurl.com/juvppxx5
Figure 2 https://support.google.com/legal/answer/3463239?hl=en
Figure 3 https://tinyurl.com/7na589sh
Figure 4 https://tinyurl.com/84fzmvxu
Figure 5 https://tinyurl.com/yk28ptuk
Prepared by
JENEBEL A. DAGOHOY

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What are the different types of forces discussed in the document?

What is Newton's First Law of Motion?

Republic of the Philippines SCIENCE 8

DEPARTMENT OF EDUCATION Quarter 1 M 1

Name of Learner: ____________ Score:

LEARNING ACTIVITY SHEET

Learning Competency with Code

Activity 2 FORCEVER CHAMP!

Activity 3 MAY THE FORCE BE WITH YOU!

1. What are the two forces acting on the box? ______________________________________

1. What is the net force or resultant force, Fnet? ___________________________

Static Friction = 20 N F1= 50 N

1. What is the magnitude of the resultant force or Fnet? 30N -30N

Objects at rest will remain at rest. Object in motion will continue to

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