2. 8 th Science Force, Motion, and Energy

3. A:B: ForceWeight #1 What is speed plus direction? Example: Geese fly about 64 km/hr when they migrate south. C:D: AccelerationVelocity

4. D. Velocity

5. A:B: ForceWeight #2 A push or pull. C:D: AccelerationAir resistance

6. A. Force

7. A:B: AccelerationAir resistance #3 What is a change in motion? (Speeding up, slowing down, changing direction). Example: An airplane slows down rate a rate of 3 m/s C:D: FrictionInertia 2

8. A. Acceleration

9. A:B: It takes energy to make force Force causes motion #4 What is the relationship between force, motion, and energy? C:D: NeitherBoth

10. D. Both A and B

11. A:B: Air resistanceFriction #5 A force that resists motion. C:D: InertiaForce

12. B. Friction

13. A:B: Air resistanceInertia #6 A measure of an object’s tendency to remain at rest or to keep moving with a constant velocity. C:D: ForceNewton

14. B. Inertia

15. A:B: One of the forces is stronger than the other Both forces are equal #7 Forces occur in pairs and each pair of forces can be either balanced or unbalanced. How can an unbalanced force change the speed or direction of an object in motion? C:D: Unbalanced forces cancel each other out, so there is no change Force

16. A. One of the forces is stronger than the other

17. A:B: NewtonsMeters #8 Which unit measures the Unit of Force? C:D: Secondsm/s 2

18. A. Newtons

19. A:B: Law 1 – Law of InertiaLaw 2 – Law of Acceleration #9 An object a rest remains at rest and an object in motion remains in motion at a constant speed unless acted upon by a unbalanced force. Ex: Seat belt Ex: pulling the table cloth out from under dishes C:D: Law 3 – Law of Action and Reaction Law 4 – Law of Conservation

20. A.Law 1 – Law of Inertia

21. A:B: Law 1 – Law of InertiaLaw 2 – Law of Acceleration #10 An object acted on by an unbalanced force will accelerate in the direction of the force. *(More force is required to move more mass.) Ex: It takes more force to move a car than a bicycle. C:D: Law 3 – Law of Action and Reaction Law 4 – Law of Conservation

22. B. Law 2 – Law of Acceleration

23. A:B: Law 1 – Law of InertiaLaw 2 – Law of Acceleration #11 Every action has an equal and opposite reaction. Ex: Rocket launching. C:D: Law 3 – Law of Action and Reaction Law 4 – Law of Conservation

24. C. Law 3 – Law of Action and Reaction

25. A:B: S = 38 km/hrS = 38 hrs #12 Measure Speed What is your speed if you travel 114 km in 3 hours? Speed = Distance Time C:D: S = 38 kmS = 3 km/hr

26. A. S = 38 km/hr

27. A:B: F = 180 kgF = 180 N #13 Measure Force What force is needed to make a 36 kg object accelerate to 5 m/s ? Force = mass x acceleration C:D: F = 108 NF = 180 m/s 2 2

28. B. F = 180 N

29. A:B: W = 300 NW = 300 M #14 How does force effect work? Work = Force x Distance (if no distance, no work) How much work would it take to move a 50 N box over 6 meters? C:D: W = 300 jW = 300 km

30. C. 300 j

31. A:B: They don’t change force or work They increase force or work #15 How do simple machines effect force or distance? C:D: They decrease force or distance None of these

32. C. They decrease force or distance

33. A:B: There is no force or gravity There is no friction or gravity #16 Why can a spacecraft travel in space at a constant speed and in a straight path? C:D: There is no friction or newton There is no weight or mass

34. B. There is no friction or gravity

35. A:B: Box will move to the left 6N Box will move to the right 6 N C:D: The force is balanced None of these #17 Calculating net force. What would be the net force in this diagram? 16N – 10N = 6N

36. A. Box will move to the left 6N

37. A:B: 150m/s 250m/s C:D: 1400m/s None of these #18 This graph relates distance to time for a jogger. Distance vs. Time At what rate of speed is Juan running between 4 min and 6 min? S= 500m/2min

38. B. 250m/s

39. A:B: Stopped Ran faster C:D: Jogging slower None of these #19 This graph relates distance to time for a jogger. Distance vs. Time What can you tell about Juan’s motion between 7 and 11 min?

40. A. Stopped

41. A:B: Light energy to chemical energy to electrical energy Sound energy to light energy to chemical energy C:D: Chemical energy to electrical energy to light energy None of these #20 *Energy transfer from one form to another. List, in order, three of the energy conversions that are present in this picture.

42. C. Chemical energy to electrical energy to light energy

43. A:B: No energy is disappears. Energy is just changed to another form Not all energy must be converted C:D: Both of these None of these #21 The Law of conservation of change states that matter cannot be created or destroyed. How does the Law of Conservation of Change apply to a flashlight?

44. A. No energy is disappears. Energy is just changed to another form

45. A:B: Motion energyStored energy #22 What is potential energy? C:D: Electrical energyNone of these

46. B. Stored energy

47. A:B: Motion energyStored energy #23 What is kinetic energy? C:D: Electrical energyNone of these

48. A. Motion energy

49. A:B: Energy can convert from kinetic to potential and back again They are not related C:D: Both are energy in motion None of these #24 How are potential energy and kinetic energy related?

50. A. Energy can convert from kinetic to potential and back again

51. A:B: Graph A Graph B C:D: Graph CNone of these #25 Which of these graphs shows a speed that is not changing (constant speed)

52. C. Graph C

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