ppt

2. SCIENCE 7
identify and describe everyday
situations that demonstrate:
BALANCED /UNBALANCED FORCES

3. BALANCED FORCES/ UNBALANCED
FORCES
CONTENT
The learners learn that Scientists and engineers
analyze forces to predict their effects on
movement.
LEARNING
STANDARD
The learners will identify and describe everyday situations that
demonstrate:
a. balanced forces such as a box resting on an inclined plane, a man
standing still, or an object moving with constant velocity;
b. unbalanced forces, such as freely falling fruit or an accelerating car;
LEARNING
COMPETENCY

4. By the end of the lesson, the 80 percent of the learners will
be able to:
1. Define balanced forces and unbalanced and explain how they
relate to an object's motion.
2. Demonstrate the concept of balanced forces and unbalanced
forces through a hands-on activity, such as observing an
object on an inclined plane.
3. Develop an appreciation for the role of balanced and
unbalanced forces in the physical world around them by
answering the reflection of learning.
OBJECTIVES

5. I. Activating Prior Knowledge
Short Review
The students will identify whether the forces are balanced or
unbalanced. Write the Resultant force and its direction.
I. Activating Prior Knowledge
UNBALANCED 50N RIGHT
Resultant force Direction

6. I. Activating Prior Knowledge
Short Review
The students will identify whether the forces are balanced or
unbalanced. Write the Resultant force and its direction.
I. Activating Prior Knowledge
BALANCED 0 N STATIONARY
Resultant force Direction

7. I. Activating Prior Knowledge
Short Review
The students will identify whether the forces are balanced or
unbalanced. Write the Resultant force and its direction.
I. Activating Prior Knowledge
UNBALANCED 10 N LEFT
Resultant force Direction

8. I. Activating Prior Knowledge
Short Review
The students will identify whether the forces are balanced or
unbalanced. Write the Resultant force and its direction.
I. Activating Prior Knowledge
UNBALANCED 70 N RIGHT
Resultant force Direction

9. I. Activating Prior Knowledge
Short Review
The students will identify whether the forces are balanced or
unbalanced. Write the Resultant force and its direction.
I. Activating Prior Knowledge
UNBALANCED 21 N RIGHT
Resultant force Direction

10. 1. Define balanced forces and unbalanced and explain how
they relate to an object's motion.
2. Demonstrate the concept of balanced forces and
unbalanced forces through a hands-on activity, such as
observing an object on an inclined plane.
3. Develop an appreciation for the role of balanced and
unbalanced forces in the physical world around them by
answering the reflection of learning.
B. Establishing Purpose of the Lesson
1. LESSON PURPOSE

11. B. Establishing Purpose of the Lesson
2. Unlocking Content Vocabulary: Match Type Activity
NORMAL
FORCE
FRICTION
AIR
RESISTANCE
The force exerted by a surface on an
object in contact with it, perpendicular to
the surface.
The force that opposes the relative motion
between two surfaces in contact.
The force that opposes the motion of an
object through a fluid, such as air.
BALANCED
FORCES
Forces that are equal in magnitude and
opposite in direction, causing an object to
remain at rest or move at constant velocity.

12.  Balanced forces are
forces that are equal in
magnitude and opposite
in direction, causing an
object to remain at rest or
move at constant
velocity.
What is Balance forces?
C. Developing and Deepening Understanding

13.  Unbalanced forces are
forces that do not cancel
each other out. When the
net force acting on an
object is not zero, the object
will accelerate in the
direction of the net force.
What is Unbalance forces?
C. Developing and Deepening Understanding

14.  A box resting on a flat surface - the force of
gravity is balanced by the normal force from the
surface.
Examples of Balanced Forces
C. Developing and Deepening Understanding

15. Pushing with the same amount of
force
 This situation demonstrates balanced
forces.
 When two people push against each
other with equal force, the forces are
balanced.
 The net force is zero, so the objects
(the people) remain at rest or
continue moving at a constant speed.
Examples of Balanced Forces
C. Developing and Deepening Understanding

16. Hanging Chandelier Attached to the
Ceiling
 This situation demonstrates balanced
forces.
 The downward force of gravity on the
chandelier is balanced by the upward
force from the ceiling where the
chandelier is attached.
 The net force is zero, so the
chandelier remains at rest.
Examples of Balanced Forces
C. Developing and Deepening Understanding

17. Examples of Balanced Forces
C. Developing and Deepening Understanding

18. Examples of Balanced Forces
C. Developing and Deepening Understanding

19. Falling stones
 This situation demonstrates
unbalanced forces.
 The downward force of gravity on the
stones is not balanced by any other
upward force.
 The net force is non-zero, specifically
downward, causing the stones to
accelerate downward.
Examples of unbalanced Forces
C. Developing and Deepening Understanding

20. Lift off of a space rocket
 This situation demonstrates
unbalanced forces.
 During liftoff, the upward thrust force
from the rocket engines is greater
than the downward force of gravity
acting on the rocket.
 The net force is non-zero, specifically
upward, causing the rocket to
accelerate upward.
Examples of unbalanced Forces
C. Developing and Deepening Understanding

21. Examples of Unbalanced Forces
C. Developing and Deepening Understanding

22. C. Developing and Deepening Understanding
Worked Example
0 At rest Balanced

23. C. Developing and Deepening Understanding
Worked Example
0 At rest Balanced

24. C. Developing and Deepening Understanding
Worked Example
100 N Moving Unbalanced

25. C. Developing and Deepening Understanding
Worked Example
-50N Moving Unbalanced

26. C. Developing and Deepening Understanding
Worked Example
0 N At rest Unbalanced

27. C. Developing and Deepening Understanding
Lesson Activity
Simple Problem Solving
Objective(s):
At the end of the activity, the learner should be able to:
1. analyze the FBD and calculate the net force along x and y axes.
2. determine the effect of balanced or unbalanced forces to the
state and direction of motion
3. categorize the specific situation from the given scenarios based
on the completed data
Materials Needed: pen

28. C. Developing and Deepening Understanding
Lesson Activity
Simple Problem Solving
Instructions:
1. Analyze the free body diagram of the different situations.
2. Determine the following:
a. net force along x and y-axes (Please indicate NA if not
applicable since no forces are present in specific axis)
b. state of motion (at rest, moving at constant speed, moving
at changing speed)
c. direction of motion (Left/Right/Upward/ Downward/NA*)
3. Identify if the situation shows balanced or unbalanced forces
along x- and y- axes.

29. C. Developing and Deepening Understanding
Lesson Activity
Simple Problem Solving
Instructions:
4. Based on the completed data, match each situation in the
template provided into the following activities :
a. pulling a cart on a smooth surface
b. oven on top of a table
c. pushing a box on a rough surface
d. moving car at constant speed
e. falling skydiver

30. C. Developing and Deepening Understanding
Lesson Activity
Simple Problem Solving

31. C. Developing and Deepening Understanding
Lesson Activity
Simple Problem Solving

32. C. Developing and Deepening Understanding
Lesson Activity
Simple Problem Solving

33. C. Developing and Deepening Understanding
Lesson Activity
Simple Problem Solving

34. D. MAKING GENERALIZATION
Learners’ Takeaways
Using the Venn Diagram, the learner will differentiate
balanced from unbalanced Forces.

35. D. MAKING GENERALIZATION
Reflection on Learning
1. Identify and describe everyday situations that
demonstrate:
a. Balanced forces
b. Unbalanced forces
2. How do balanced and unbalanced forces affect
the motion of an object?

36. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________ 1. Which of the following
situations demonstrates balanced forces?
a) A book sitting on a table
b) A ball rolling across the floor
c) A person jumping up
d) A car accelerating from a stop

37. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________ 2. Which of the following is true
about balanced forces?
a) They cause an object to change speed or
direction
b) They result in a non-zero net force
c) They cause an object to accelerate
d) They result in the object remaining at
rest or moving at constant speed

38. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________ 3. Which of the following
situations demonstrates unbalanced
forces?
a) Two people pushing against each other
with equal force
b) A floating block of wood
c) A sports car moving at constant speed
d) A hanging chandelier attached to the
ceiling

39. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________ 4. Which of the following is true
about unbalanced forces?
a) They result in a zero net force
b) They do not cause a change in an
object's motion
c) They cause an object to move at
constant velocity
d) They cause an object to change its
velocity

40. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________ 5. A book is sitting on a table.
The forces acting on the book are:
a) Balanced, with a net force of zero
b) Unbalanced, with a net force downward
c) Balanced, with a net force upward
d) Unbalanced, with a net force in an
unknown direction

41. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________ 6. A person is jumping up. The
forces acting on the person are:
a) Balanced, with a net force of zero
b) Unbalanced, with a net force upward
c) Balanced, with a net force downward
d) Unbalanced, with a net force in an
unknown direction

42. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________ 7. A ball is rolling across the
floor. The forces acting on the ball are:
a) Balanced, with a net force of zero
b) Unbalanced, with a net force in the
direction of motion
c) Balanced, with a net force opposing the
direction of motion
d) Unbalanced, with a net force
perpendicular to the direction of motion

43. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________ 8. A car is accelerating from a
stop. The forces acting on the car are:
a) Balanced, with a net force of zero
b) Unbalanced, with a net force in the
direction of motion
c) Balanced, with a net force opposing the
direction of motion
d) Unbalanced, with a net force
perpendicular to the direction of motion

44. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________ 9. Two people are pushing against
each other with equal force. The forces acting on
each person are:
a) Balanced, with a net force of zero
b) Unbalanced, with a net force in the direction of
motion
c) Balanced, with a net force opposing the
direction of motion
d) Unbalanced, with a net force perpendicular to
the direction of motion

45. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
_________ 10. A block of wood is floating on
water. The forces acting on the block are:
a) Balanced, with a net force of zero
b) Unbalanced, with a net force upward
c) Balanced, with a net force downward
d) Unbalanced, with a net force in an unknown
direction

46. E. EVALUATING LEARNING
E. EVALUATING LEARNING
E. EVALUATING LEARNING
1. a) A book sitting on a table
2. d) They result in the object remaining at rest or moving at
constant speed
3. b) A ball rolling across the floor
4. d) They cause an object to change its velocity
5. a) Balanced, with a net force of zero
6. b) Unbalanced, with a net force upward
7. b) Unbalanced, with a net force in the direction of motion
8. b) Unbalanced, with a net force in the direction of motion
9. a) Balanced, with a net force of zero
10. a) Balanced, with a net force of zero
ANSWERS KEY

47. Reference :
•SCIENCE 7 LESSON EXEMPLAR
DewWool. (n.d.). Retrieved from 20 Examples of balanced forces: https://dewwool.com/20-
examples-of-balanced-forces/
● Phyley. (n.d.). Phyley. Retrieved from https://www.phyley.com/#force-and-motion
● The Physics Classroom. (n.d.). Rocket Sled Interactive. Retrieved from The Physics
Classroom:
https://www.physicsclassroom.com/Physics-Interactives/Newtons-Laws/Rocket-Sledder/
Rocket-Sledder-Interactive
● Thompson, D. (2023, April 21). What are Balanced and Unbalanced Forces? A Guide for
Young Scientists. Retrieved from The Science
Times: https://www.sciencetimes.com/articles/43390/20230421/what-are-balanced-and-
unbalanced-forces-a-guide-for-young
scientists.htm
● University of Colorado Boulder, licensed under CC-BY-4.0 (https://phet.colorado.edu). (n.d.).
Simulation by PhET Interactive
Simulations. Retrieved from
https://phet.colorado.edu/sims/html/forces-and-motion-basics/latest/forces-and-motion-
basics_en.html
● University of Colorado Boulder, licensed under CC-BY-4.0. (n.d.). Simulation by PhET
Interactive Simulations. Retrieved from https://phet.colorado.edu