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8 th Science Force, Motion, and Energy

8 th Science Force, Motion, and Energy. #1 What is speed plus direction ? Example: Geese fly about 64 km/ hr when they migrate south. Force. Weight. A:. B:. Acceleration. Velocity. C:. D:. D. Velocity. #2 A push or pull. Force. Weight. A:. B:. Acceleration.

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8 th Science Force, Motion, and Energy

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  1. 8th Science Force, Motion, and Energy

  2. #1 What is speed plus direction? Example: Geese fly about 64 km/hr when they migrate south. Force Weight A: B: Acceleration Velocity C: D:

  3. D. Velocity

  4. #2 A push or pull. Force Weight A: B: Acceleration Air resistance C: D:

  5. A. Force

  6. #3 What is a change in motion? (Speeding up, slowing down, changing direction). Example: An airplane slows down at a rate of 3 m/s 2 Acceleration Air resistance A: B: Friction Inertia C: D:

  7. Acceleration

  8. #4 What is the relationship between force, motion, and energy? It takes energy to make force Force causes motion A: B: Neither Both C: D:

  9. D. Both A and B

  10. #5 A force that resists motion. • Air resistance Friction A: B: Inertia Force C: D:

  11. B. Friction

  12. #6 A measure of an object’s tendency to remain at rest or to keep moving with a constant velocity. Air resistance Inertia A: B: Force Newton C: D:

  13. B. Inertia

  14. #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? One of the forces is stronger than the other Both forces are equal A: B: Unbalanced forces cancel each other out, so there is no change Force C: D:

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

  16. #8 Which unit measures the Unit of Force? Newtons Meters A: B: 2 Seconds m/s C: D:

  17. A. Newtons

  18. #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 Law 1 – Law of Inertia Law 2 – Law of Acceleration A: B: Law 3 – Law of Action and Reaction Law 4 – Law of Conservation C: D:

  19. Law 1 – • Law of Inertia

  20. #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 Law 1 – Law of Inertia Law 2 – Law of Acceleration A: B: Law 3 – Law of Action and Reaction Law 4 – Law of Conservation C: D:

  21. B. Law 2 – Law of Acceleration

  22. #11 Every action has an equal and opposite reaction. Ex: Rocket launching. Law 1 – Law of Inertia Law 2 – Law of Acceleration A: B: Law 3 – Law of Action and Reaction Law 4 – Law of Conservation C: D:

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

  24. #12 Measure Speed What is your speed if you travel 114 km in 3 hours? Speed = Distance Time S = 38 km/hr S = 38 hrs A: B: S = 38 km S = 3 km/hr C: D:

  25. A. S = 38 km/hr

  26. #13 Measure Force What force is needed to make a 36 kg object accelerate to 5 m/s ? Force = mass x acceleration 2 F = 180 kg F = 180 N A: B: 2 F = 108 N F = 180 m/s C: D:

  27. B. F = 180 N

  28. #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? W = 300 N W = 300 M A: B: W = 300 j W = 300 km C: D:

  29. C. 300 j

  30. #15 Why can a spacecraft travel in space at a constant speed and in a straight path? There is no force or gravity There is no friction or gravity A: B: There is no weight or mass There is no friction or newton C: D:

  31. B. There is no friction or gravity

  32. #16 Calculating net force. What would be the net force in this diagram? 16N – 10N = 6N Box will move to the left 6N Box will move to the right 6 N A: B: The force is balanced None of these C: D:

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

  34. #17 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 250m/s 150m/s A: B: None of these 1400m/s C: D:

  35. B. 250m/s

  36. #18 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? Ran faster Stopped A: B: None of these Jogging slower C: D:

  37. A. Stopped

  38. #19 What is potential energy? Motion energy Stored energy A: B: Electrical energy None of these C: D:

  39. B. Stored energy

  40. #20 What is kinetic energy? Motion energy Stored energy A: B: Electrical energy None of these C: D:

  41. A. Motion energy

  42. #21 How are potential energy and kinetic energy related? Energy can convert from kinetic to potential and back again They are not related A: B: Both are energy in motion None of these C: D:

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

  44. #22 Which of these graphs shows a speed that is not changing (constant speed) Graph B A: B: Graph A Graph C None of these C: D:

  45. C. Graph C

  46. Great Job!!!! Thank you for playing!

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