2. 8 th Science Force, Motion, and Energy

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

4. D. Velocity

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

6. A. Force

7. A:B: AccelerationAir resistance C:D: FrictionInertia 2 #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

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

14. B. Inertia

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

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 C:D: Law 3 – Law of Action and Reaction Law 4 – Law of Conservation #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

20. A.Law 1 – Law of Inertia

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

22. B. Law 2 – Law of Acceleration

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

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

32. B. There is no friction or gravity

33. 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 #16 Calculating net force. What would be the net force in this diagram? 16N – 10N = 6N

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

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

36. B. 250m/s

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

38. A. Stopped

39. A:B: Motion energyStored energy #19 What is potential energy? C:D: Electrical energyNone of these

40. B. Stored energy

41. A:B: Motion energyStored energy #20 What is kinetic energy? C:D: Electrical energyNone of these

42. A. Motion energy

43. 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 #21 How are potential energy and kinetic energy related?

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

45. A:B: Graph A Graph B C:D: Graph CNone of these #22 Which of these graphs shows a speed that is not changing (constant speed)

46. C. Graph C

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