G8-NAT'L LEARNING CAMP-Science-Lesson-24.pptx

G8-NAT'L LEARNING CAMP-Science-Lesson-24

1. SCIENCE 8: Balancing and Moving a Wheelbarrow

2. KEY IDEA When the forces acting on an object are balanced, there is no net force ( Fnet ) and so the object will not move. When the forces acting on an object are unbalanced, there is net force ( Fnet ) and so the object will move. To move an object, a property of matter that resists changes in motion, called Inertia, needs to be overcome by applying a net force to the object.

3. COMPONENT 1: Short Review Q2. What does the word balance mean in everyday terms? Answer: To break something open, like to force a door open; A (force) field; A push or a pull; Something that makes things move – like a magnet pulling a metal toy.

4. COMPONENT 1: Short Review Q2. What does the word force mean in everyday terms? Answer: When something is stable; Equal; Not falling over.

5. COMPONENT 1: Short Review Q3. What does balance mean in scientific terms when we are referring to forces? Answer: The forces are the same; The forces are cancelling each other; One force counteracts the other.

6. COMPONENT 2: Lesson purpose/Intention Explain to the students that this lesson is about balanced and unbalanced forces and how forces can affect the way an object moves. The lesson may also help students to be better at using arrows or symbols to communicate information in science.

7. COMPONENT 3: Lesson Language Practice Read the following words Wheelbarrow Balanced forces Unbalanced forces Represent/Representations

8. COMPONENT 4: Lesson Activity Component 4A

9. COMPONENT 4: Lesson Activity Component 4B Q1. The wheelbarrow is at rest. What does that mean? Answer: It is not moving.

10. COMPONENT 4: Lesson Activity Component 4B Q2.Are there any forces acting on the wheelbarrow while it is at rest? If so, please list any? Answer: Yes; Gravity, or Normal force (Opposing force)

11. COMPONENT 4: Lesson Activity Component 4B Q3. What does a person need to do to move the wheelbarrow forward by 2 meters? Answer: A person would need to firstly lift the handles of the wheelbarrow so the wheel will work (so they apply a vertical force against gravity) then secondly push the wheelbarrow forward (to overcome inertia)

12. COMPONENT 4: Lesson Activity Component 4C Q1. While the wheelbarrow is at rest, are the forces acting on it balanced or unbalanced? Answer: Balanced (The force of Gravity acting down is balanced by a Normal force acting up).

13. COMPONENT 4: Lesson Activity Component 4C Q2. On the diagram in your worksheet, use force arrows to represent the forces acting on the wheelbarrow while it is at rest? Answer:

14. COMPONENT 4: Lesson Activity Component 4C Q3. On the same diagram in your worksheet, add more force arrows to represent the forces that would need to be applied to make the wheelbarrow move forward ? Answer:

15. COMPONENT 4: Lesson Activity Component 4C Q4. Which of the arrows you added will represent the wheelbarrow having an unbalanced force? Please explain your answer. Answer: The second arrow is the one that produces the unbalanced force situation. It is unbalanced because there is no force opposing it in the same or opposite direction.

16. PULL

17. PUSH

18. SPIN

19. PUSH

20. ROLL

21. SLIDE

22. PUSH

23. ROLL

24. PUSH

25. PUSH

26. SWING

27. PULL

28. PUSH

29. ROLL

30. ROLL

31. PUSH

32. ROLL

33. PUSH

34. PULL

35. SWING

36. ROLL

37. PULL

38. SPIN

39. ROLL

40. SLIDE

41. SPIN

42. SWING

43. SLIDE

44. SPIN

45. SWING

46. SWING

47. SPIN

48. SPIN

49. SWING

50. SWING