Frictional Force

3. More friction means more heat and less motion.

4. What would life be without friction? Well, life
would be impossible without friction. We use friction in
most of our activities everyday. You would be able to
walk without slipping and falling with the help of friction.
Friction affects different objects too. Friction can be
rolling, sliding, fluid, and static. This lesson focuses on
describing what is friction or Frictional Force, how it
works on different surfaces such as in smooth or rough
surface. You will also learn the concept on how friction
affects the movement of different objects and people
and its usefulness in performing our daily tasks and
activities.

5. What I Need To Know
After going through this lesson, you are expected to:
1. Describe what is friction or frictional force; (S6FE-IIIa-c-1);
2. Perform activity that shows how friction works on smooth and
rough surfaces; and
3. Value the importance of frictional force in performing tasks
and daily activities.

6. What I Know
Directions: Read and analyze each item carefully. Write the letter that
correspond the best answer in your activity notebook.
1. It is a push or pull that starts, stops or changes the direction of an object.
A. Motion B. Energy C. Force D. Food
2. Which kind of force opposes motion between two surfaces sticking or touching
together?
A. Gravity B. Electric C. Magnetic D. Friction
3. Which has the greatest friction among these kinds of surfaces?
A. Polished floor C. Wet floor
B. Sandy floor D. Tiled floor
4. Friction is a force that opposes motion. It acts in the direction of a moving
object.
A. opposite B. same C. upward D. downward
5. Which activities are suited to be performed in a smooth surface or floor?
A. Playing soccer football and baseball
B. Ballet dancing and roller-skating
C. Playing tug of war and hide and seek
D. Applying lubricant on it like oil or wax

7. What I Know
Directions: Read and analyze each item carefully. Write the letter that
correspond the best answer in your activity notebook.
1. It is a push or pull that starts, stops or changes the direction of an object.
A. Motion B. Energy C. Force D. Food
2. Which kind of force opposes motion between two surfaces sticking or touching
together?
A. Gravity B. Electric C. Magnetic D. Friction
3. Which has the greatest friction among these kinds of surfaces?
A. Polished floor C. Wet floor
B. Sandy floor D. Tiled floor
4. Friction is a force that opposes motion. It acts in the direction of a moving
object.
A. opposite B. same C. upward D. downward
5. Which activities are suited to be performed in a smooth surface or floor?
A. Playing soccer football and baseball
B. Ballet dancing and roller-skating
C. Playing tug of war and hide and seek
D. Applying lubricant on it like oil or wax

8. What’s In
Review: “ SIMPLE RECALL ”
Directions: Rearrange the jumbled letters
to form the concept learned in the previous
lesson through context clue. Write your
answer in your Activity Notebook.

9. CREOF
-is a push or pull that starts, stops, or changes
the direction of an object

10. FORCE

11. MGAENT
– keeps refrigerator door stays closed to
conserve energy

12. MAGNET

13. GARIVTY
– keeps orbiting planets in place as they
moved around the sun

14. GRAVITY

15. ETRICITCELY
– allows computer and other
gadgets at work

16. ELECTRICITY

17. NCLEAUR
– is the force that holds the particles
in the nucleus together

18. NUCLEAR

19. What’s New
Activity 1: “ FOUR PICS IN ONE
WORD”
Directions: Study the relationships of the
four pictures below. Identify the word that
would best describe the four pictures.
Write your answer in the boxes below.

20. Picture of person
walking
mopping the floor
sandpaper
writing on paper

21. What Is It
Activity 2: “CONNECT and REFLECT”
Directions: Connect the phrases in
Column A to its appropriate pictures in
Column B. Write the letters of the
correct answer on your Activity
notebook.

22. COLUMN A
___ 1. brick wall
___ 2. rocky road
___ 3. tiled floor
___ 4. carpeted floor
___ 5. shiny laptop
A
B
C
D
E

23. Questions:
1. Based on your answers, can you identify the
pictures in which people or objects can easily move?
What are they?
2. Are they smooth or rough surfaces?
3. What about the pictures which seem to be harder
for people and objects to move forth and back?
4. What kind of surface is it, smooth or rough?
5. Do people and objects move at the same force and
speed in both smooth and rough surfaces? Why do
you think so?
6. What do you think affects the movement of
different objects in any kinds of surface they travel
or move?
7. What is Friction?

24. Conclusion: Make a conclusion based
on the given activity.
____________________________________________
____________________________________________
____________________________________________
____________________________________________
____________________________________________
____________________________________________
____________________________________________
____________________________________________
____________________________________________

25. Discussion:
Friction is a force that opposes motion
between two surfaces sticking or touching
together. It causes an object that moves along
a surface to slow down and eventually stop.
Friction or Frictional force is always high or
more on a rough surface and it is low or less
on a smooth surface. The movement of
people and objects are greatly affected by
friction in relation to the kind of surface
where they travel or move. Friction can be
classified as sliding, rolling, fluid, and static.

26. TYPES OF FRICTION
There are 4 types of friction:
sliding Friction static friction
Fluid friction Rolling Friction

27. Friction is useful, but sometimes harmful.
It brings desirable and undesirable
effects to objects and people. Friction
could be reduced by applying lubricants
to surfaces, reducing and minimizing
contact between surfaces, and using
aerodynamic shapes. Therefore, it would
be best to observe and practice
precautionary measures all the time while
performing our daily tasks and activities
at home and in school for our SAFETY.

28. What Creates More Friction?
Rough Surfaces
Rough surfaces have more microscopic hills &
valleys.
The rougher the surface, the greater the
friction will be.
Greater Force
The amount of force exerted increases the
amount of friction
Changing the amounts of the surfaces that
touch does NOT change the amount of
friction.

29. Friction is greater when surfaces are pushed
together with more force.
5

30. SURFACE TEXTURE
For friction the object moving should touch the surface ,then
only there comes a frictional force. So a surface plays a very
important role in frictional force. Surfaces can be smooth or
rough.
The smoother the surface is ,the lesser is the frictional force.
That is a why a ball travels a great distance over a tiled
floor than a carpeted floor.

31. What’s More
Activity 3: “KNOW ME BETTER”
Directions: Analyze carefully each given kind of surface and
condition. Write a 😊 symbol on the space if it shows a
smooth surface and a 😔 if it is a rough surface. Write your
answer in your Activity Notebook.
___1. skating ring ___6. Cellphone screen
___2. grass court ___7. corals
___3. mirror ___8. glass
___4. brick floor ___9. alligator
___5. sandpaper ___10. metal

32. What I Have Learned
Directions: Fill in the blank with the correct word to
complete the concept learned. Choose the correct word from
the box below. Use your activity notebook in writing your
answer.
*Friction *smooth *opposes * high *force
*rough *sticking *low *two *touching
I have learned that ________ is a ________ that
_______ motion between ________ surfaces
________ or ________ together. Frictional force
is less or ________ on a ________ surface while
it is more or _________ on a ________ surface.

33. What I Have Learned
Directions: Fill in the blank with the correct word to
complete the concept learned. Choose the correct word from
the box below. Use your activity notebook in writing your
answer.
*Friction *smooth *opposes * high *force
*rough *sticking *low *two *touching
I have learned that ________ is a ________ that
_______ motion between ________ surfaces
________ or ________ together. Frictional force
is less or ________ on a ________ surface while
it is more or _________ on a ________ surface.
Friction force
opposes two
touching sticking
low smooth
high rough

34. What I Can Do
Activity 4: “ HIGH OR LOW FRICTIONAL FORCE ”
Directions: Analyze carefully each given object or surface
whether each possesses HIGH or LOW frictional force. Do this in
your activity notebook. Note: An example has been given for you.

35. What I Can Do
Activity 4: “ HIGH OR LOW FRICTIONAL FORCE ”
Directions: Analyze carefully each given object or surface
whether each possesses HIGH or LOW frictional force. Do this in
your activity notebook. Note: An example has been given for you.
Low
High
Low
High
High
High
High
Low
Low
Low

36. Assessment
Multiple Choice Test
Directions: Read and analyze each item carefully. Choose the letter that
corresponds to your answer. Write your answer in your Activity Notebook.
1. It is defined as a push or pull that starts, stops or changes the direction of a
moving object.
A. Motion B. Force C. Energy D. Food
2. It is a force that opposes motion between two surfaces sticking or touching
together.
A. Gravity B. Electrical C. Friction D. Magnetic
3. Which has the greatest frictional force among these surfaces?
A. Polished floor B. Tiled floor C. Wet floor D. Sandy floor
4. Friction is a force that opposes motion. It acts in the direction of a moving object.
A. same B. opposite C. upward D. downward
5. Which of the following statements best describes friction?
A. It is a force that occurs when surfaces touch each other.
B. It is a force that occurs in smooth surfaces.
C. It is a force that occurs between solids and liquids.
D. It is a force that occurs only on rough surfaces.

37. Assessment
Multiple Choice Test
Directions: Read and analyze each item carefully. Choose the letter that
corresponds to your answer. Write your answer in your Activity Notebook.
1. It is defined as a push or pull that starts, stops or changes the direction of a
moving object.
A. Motion B. Force C. Energy D. Food
2. It is a force that opposes motion between two surfaces sticking or touching
together.
A. Gravity B. Electrical C. Friction D. Magnetic
3. Which has the greatest frictional force among these surfaces?
A. Polished floor B. Tiled floor C. Wet floor D. Sandy floor
4. Friction is a force that opposes motion. It acts in the direction of a moving object.
A. same B. opposite C. upward D. downward
5. Which of the following statements best describes friction?
A. It is a force that occurs when surfaces touch each other.
B. It is a force that occurs in smooth surfaces.
C. It is a force that occurs between solids and liquids.
D. It is a force that occurs only on rough surfaces.

38. Additional Activities
Directions: Perform a simple “Do It Yourself” activity at
home. Get a ball or a toy car. Let it move forth and back
over a smooth table . Observe how it moves. Then, using
the same ball or toy car let it moves on something rough
surface like a
sandy or rocky ground. Observe again the movement of
the object. Record your observations in your Activity
Notebook .
Remember to OBSERVE SAFETY PRECAUTIONS while
performing the “Do It Yourself” activity at home. Good
luck!