FORCES AND MOTION GRADE 8 QUARTER 1 pptx

Forces and Motion lesson in Grade 8 Quarter I Science

1. OBJECTIVES OBJECTIVES The students are expected to: d efine force by giving examples. describe motion as a push or a pull determine the effects of force on motion

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

3. Is there a FORCE here?

4. Is there a FORCE here?

5. Is there a FORCE here?

6. Is there a FORCE here?

7. DISPLACEMENT difference between an object’s final position and its starting position.

8. VELOCITY Speed of an object at a certain direction

9. ACCELERATION Rate of change in velocity of an object.

10. Examples of FORCE Turn on the lights Open/close the door Move your chair forward or backward.

11. Now, what is FORCE? Push or P ull applied on an object It makes object move, change shape and motion and stop moving

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

13. 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.

14. 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?

15. Does force always make objects move? NO!

16. Line of action

17. Sir Isaac Newton

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

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

20. Which of these activity shows applied force?

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

22. Which of these pictures shows Friction force?

23. Examples of CONTACT FORCES Normal, F N - force that acts perpendicular to the object, balances the object F N

24. Which of these pictures shows Normal Force?

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

26. Which of these pictures shows Tension Force?

27. 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