Forces and Motion lesson in Grade 8 Quarter I Science

2. OBJECTIVES
OBJECTIVES
The students are expected to:
 define force by giving examples.
 describe motion as a push or a pull
• determine the effects of force on
motion

3. Rearrange the jumbled letters to
form the magic word.
C E O F R
F O R C E

13. ACTIVITY # 1
Charade
One student act out an activity
that involve some kind of
force, while the rest guesses
what action is portrayed.

14. ACTIVITY # 2
1,2,3, GO!
One student moves the ball.
Second student stop the ball.
Third student increase the velocity of
the ball.
Fourth student change the direction
Of the ball.

15. ACTIVITY # 2
1,2,3, GO!
How did you make the ball move?
How did you stop the ball?
How did you accelerate the ball?
How did you change the direction
of the ball?

16. Does force always
make objects move?

22. TYPES OF FORCE
1. Contact Force- one object needs physical
contact with another object.
force that is “given”

23. Examples of CONTACT FORCES
Applied Force, F -force applied by an object
or person to another object
or person.

24. Which of these activity shows applied force?

25. Examples of CONTACT FORCES
Friction, FF -force that acts opposite to the
direction of motion.

26. Which of these pictures shows
Friction force?

27. Examples of CONTACT FORCES
Normal, FN -force that acts perpendicular
to the object, balances the object
FN

28. Which of these pictures shows Normal Force?

29. Examples of CONTACT FORCES
Tension, FN -force applied to a chain, rope,
cable, string and the likes.
Resist force that causes
objects to stretch.

30. Which of these pictures shows Tension Force?

31. • Force A. Force in physical contact with
each other
• Contact Force B. Force exerted by an object to
another object.
• Applied Force C. Force at 90 degrees with the
object
• Force of Friction D. Always applied in opposite
direction with motion
• Normal Force E. Force exerted to prevent object to
stretch such as string, cables or in
bridges
• Tension Force F. A push or pull