WORK_Class obsevartion quarter 1 science 8.pptx

WORK_Class obsevartion quarter 1 science 8

1. Prayer

2. Good Morning!

3. Review

4. Review Sci-Henyo

5. Review Sci-Henyo 5 volunteers

6. Review Sci-Henyo Mechanics: Each volunteer student will stand in front and will face their classmates. A word will be presented on the screen, and they will guess that word. The volunteer will choose 1 classmate to give him/her clue about the word. The class can only give clue 3 times.

7. Ready?

8. WORD no. 1 ACCELERATION

9. WORD no. 2 NEWTON

10. WORD no. 3 FORCE

11. WORD no. 4 INERTIA

12. WORD no. 5 GRAVITY

13. WELL DONE !

14. Guess the Job Using emoji

15. 1

16. 2

17. 3

18. 4

19. 5

20. 6

21. 7

22. WORK

23. In physics, work is an abstract related to energy. WORK When work is done by an object it loses energy and when work is done on an object it gains energy .

24. Work is done when the force (F) applied to the object causes the object to have a displacement (d) in the same direction as the force applied. WORK

25. WORK, NO WORK Activity

26. WORK, NO WORK Activity Directions: Point the arrows to the direction of Force and Displacement on the board and tell whether each situations shows Work Done or No Work Done.

27. WORK, NO WORK

28. WORK, NO WORK

29. WORK, NO WORK

30. WORK, NO WORK

31. WORK, NO WORK

32. Work is done when the force (F) applied to the object causes the object to have a displacement (d) in the same direction as the force applied. Remember!

33. Example

34. Example

35. Work or No Work Legit or Fake News

36. …pushing against the wall. Work or No Work I do work by…

37. …pushing against the chair. I do work by… Work or No Work

38. …reading a book. I do work by… Work or No Work

39. …raising the flag during flag ceremony I do work by… Work or No Work

40. …pushing a shopping cart forward I do work by… Work or No Work

41. I do work by… …carrying a box. Work or No Work

42. I do work by… …kicking a ball Work or No Work

43. The symbol for work is a capital W . The work done by a force can be calculated as CALCULATING WORK W = Fd Work = Force x displacement

44. Unit of Work W = Fd Unit of work = Nm J = kg m   Unit of work = Joules or J m s 2 1J = 1kg   m s 2 2

45. Solving Problems 1: How much work is done by a 12N force acting on an object and moving it at a distance of 1.5m?

46. Solving Problems 2: A body moves through a distance of 9 m while a force of 24 Newton acts on it. What is the work done by the force on the body?

47. Solving Problems 3: Two men exerted a force of 1080 N to push the car 218m to the nearest fuel station. Determine the work done on the car.

48. APPLICATION

49. GALLERY “WORK”

50. Problem 1 Leo uses a force of 15 N to push a grocery cart a distance of 4 meters. How much work does he do?

51. Problem 2 A block is pulled by a constant force of 40 Newton, and moved 17m from its original place. How much work was done to make the block move?

52. Problem 3 A person applies a force of 120 Newtons to push a box a distance of 15 meters. Calculate the work done.

53. Assessment

54. What is the formula for calculating work done (W) in physics? A. W = Fd B. W = ma C . W = E/t D . W = Pt 1

55. One Joule is equivalent to : 1N m 3 1kg m 3 1watt 2 N 1kg m 2 s 2   2

56. When does no work occur in a physics context? A. When an object is stationary B. When an object is in motion C. When a force is applied to an object D. When energy is conserved 3

57. Which unit is used to measure work ? A. Joules (J) B. Newton (N) C. Watts (W) D. Kilogram (kg) 4

58. How much work is required if you applied 2N force to a box and move to a height of 10 meters? 5 J 20 J 100 J 200 J 5