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Category 1

Category 1. 10. 20. 30. 40. 50. Category 2. 10. 20. 30. 40. 50. Category 3. 10. 20. 30. 40. 50. Category 4. 10. 20. 30. 40. 50. Category 5. 10. 20. 30. 40. 50. Category 1 questions follow. Category 1. 10. At what point will the car have the most kinetic energy? A

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Category 1

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  1. Category 1 10 20 30 40 50 Category 2 10 20 30 40 50 Category 3 10 20 30 40 50 Category 4 10 20 30 40 50 Category 5 10 20 30 40 50

  2. Category 1 questions follow

  3. Category 1 10 At what point will the car have the most kinetic energy? A B C D

  4. Category 1 . At what point will the car have the most kinetic energy? A B C D 10 Remember; KE is energy of motion! The total energy is conserved, so when PE is the lowest, KE is the highest or It has had the most time to fall

  5. Category 1 20 At what point is the cart moving the slowest?

  6. Category 1 20 At what point is the cart moving the slowest? The minimum speed occurs near the top of the incline

  7. Category 1 30 If G is twice as high as E, then G has 2 X the energy ½ the energy 4 X the energy

  8. Category 1 30 If G is twice as high as E, then G has 2 X the energy ½ the energy 4 X the energy

  9. Category 1 40 The greatest potential energy is at A B C D E

  10. Category 1 Greatest gravitational potential energy at greatest height It is also slowest at this point The greatest potential energy is at A B C D E 40

  11. Category 1 50 If the plumb has 10 joules when it is straight out, what is the kinetic energy when it is hanging straight down?

  12. Category 1 50 If the plumb has 10 joules when it is straight out, what is the kinetic energy when it is hanging straight down? The change in potential energy = Kinetic energy so when PE = 0, then KE = 10

  13. Category 2 questions follow

  14. Category 2 10 After the sling shot is released, the kinetic energy in the band has been converted into ___________

  15. Category 2 10 After the sling shot is released, the kinetic energy in the band has been converted into HEAT__

  16. Describe the result if the ball has a greater mass than the cannon 20

  17. Category 2 Describe the result if the ball has a greater mass than the cannon 20 • The cannon will have a greater velocity backwards and you would be in more danger than anyone in front of the cannon

  18. Category 2 30 Which would need to have a stronger dam to hold back the force of water, a deep pond or a shallow pond with 10 X the amount of water?

  19. Category 2 30 Which would need to have a stronger dam to hold back the force of water, a deep pond or a shallow pond with 10 X the amount of water? The deeper the pond, the greater height & greater force

  20. Category 2 40 If you are building a roller coaster, at what points would you need a motor, and not gravity to produce motion?

  21. Category 2 40 If you are building a roller coaster, at what points would you need a motor, and not gravity to produce motion? Only to get them to the top of the first, tallest hill

  22. Category 2 50 According to the Conservation of energy, the potential energy is converted to mechanical energy of motion. Part of this energy is lost as _____

  23. Category 2 50 According to the Conservation of energy, the potential energy is converted to mechanical energy of motion. Part of this energy is lost as _____HEAT into environment or in the machinery

  24. Category 3 questions follow

  25. Category 3 10 Work = F X D If the horse moves 1000 kg a distance of 10 meters, _________ amount of work is done.

  26. Category 3 Work = F X D If the horse moves 1000 kg a distance of 10 meters, _________ amount of work is done. 10 Work = F X D Work = 10 000 N X 10 m Work = 100 000 N-M Work = 100 000 J Force = mass X gravity Force = 1000 kg X 10 m/s2 F = 10 000 Kg-m/s2 Force = 10 000 N

  27. Category 3 20 Does the boy do work on the tree?

  28. Category 3 20 Does the boy do work on the tree? For ever action there is an equal and opposite reaction. If the tree does not move, there is no work. He boy does no work

  29. Category 3 30 How much work is done? Depends on how hard he pushes No work

  30. Category 3 30 How much work is done? Depends on how hard he pushes No work If it doesn’t move, there is no work

  31. Category 3 40 The slingshot shoots a marble forward. Compare the velocity and momentum of both the slingshot and the marble

  32. Category 3 40 The slingshot shoots a marble forward. Compare the velocity and momentum of both the slingshot and the marble The momentum would be the same for both P = mv, so the slingshot mv = mv of marble But the mass of the marble is smaller than the slingshot, so it would move many times faster than the slingshot

  33. Category 3 50 What is the significance of the direction of the force arrow?

  34. Work properly defined is the force along the direction of displacement multiplied by the magnitude of the displacement Category 3 What is the significance of the direction of the force arrow? When you’re pulling at an angle, you’re not applying a force in the exact same direction as the direction of motion. More force is required to do the same amount of work if you pull at a larger angle. To find the work in this case, you find the component of the force along the direction of motion. 50

  35. Category 4 questions follow

  36. Category 4 10 What is the IMA of the 2 pulleys?

  37. Category 4 10 What is the IMA of the 2 pulleys? Left is 1 Right is 2

  38. Category 4 F = ma Wt = mg If a 1 kg apple falls 10 meters from a tree, the apple would hit with a force of __________ 20

  39. Category 4 F = ma Wt = mg If a 1 kg apple falls 10 meters from a tree, the apple would hit with a force of __________ Force = m X a Force = 1 kg X 10 m/s2 Force = 10 kg-m/s2 = 10 N 20

  40. Category 4 30 If the output force is 100 kg, then the input could be ___________

  41. Category 4 30 If the output force is 100 kg, then the input could be ___________ The input can be higher, but not lower than 100 kg. There is no 100% efficient machine!

  42. Category 4 40 A level may allow you to lift a mass that is too large for you to normally lift, but it is at the expense of __________

  43. Category 4 40 A level may allow you to lift a mass that is too large for you to normally lift, but it is at the expense of __________ Distance Work = Force X distance

  44. Category 4 50 What is the power needed to raise 6 Newtons over a distance of 6 meters in 10 seconds?

  45. Category 4 50 Power = force X distance divided by time What is the power needed to raise 6 Newtons(force) over a distance of 6 meters in 10 seconds? Power = 6 N X 6 m = 36 N-m/10 sec = 3.6 N-m/s = 3.6 W 10 sec

  46. Category 5 questions follow

  47. Category 5 10 Work = Force X Distance Power = work/time On day 1 a Girl walks 1 mile in 20 minutes. On day 2 a Girl walks 2 miles in 20 minutes She used twice the power on day 2 She did twice the work on day 2 Both a and b are correct

  48. Category 5 10 Work = Force X Distance Power = work/time On day 1 a Girl walks 1 mile in 20 minutes. On day 2 a Girl walks 2 miles in 20 minutes She used twice the power on day 2 She did twice the work on day 2 Both a and b are correct

  49. Category 5 20 Work = Force X Distance If you push 4 times as far, using the same force the work is ___________as much 4 times ½ 8 Times

  50. Category 5 20 Work = Force X Distance If you push 4 times as far, using the same force the work is ___________as much 4 times ½ 8 Times

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