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      Ch 8 Work, Power, & Machines on QuizRevolution


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      Ch 8 Work, Power, & Machines
      myStudiyo Media
      Question
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      Ch 8 Work, Power, & Machines
      Points for Question
      100
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      Hi Score
      5,200
      A moving car has 2000J of kinetic energy. If the car’s velocity doubles, then the KE = ___
      Wrong
       of players answered correctly.
      • 8000 Joules

      • 4000 Joules

      • 2000 Joules

      • 1000 Joules

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      Comments:
      1. A moving car has 2000J of kinetic energy. If the car’s velocity doubles, then the KE = ___
        1. 8000 Joules
        2. 4000 Joules
        3. 2000 Joules
        4. 1000 Joules
      2. Power is defined as the __.
        1. rate at which work is done
        2. equal to the work done divided by time
        3. change in energy divided by time
        4. all of the above
      3. wheel with a groove on outside for a rope to move around it is a __.
        1. wheel and axle
        2. screw
        3. gear
        4. pulley
      4. Simple Machines make you more powerful
        1. true
        2. false
      5. The weight being lifted by the simple machine is called __.
        1. object
        2. effort force
        3. load
        4. input force
      6. a device used for increasing a force or simply changing direction of a force is a __
        1. simple machine
        2. compound machine
        3. machine
        4. mechanism
      7. You push on a wall and the wall does not move...
        1. work is done on the wall
        2. work is not done on the wall
        3. not enough info to say
      8. the pivot point for a lever is called __.
        1. axle
        2. joint
        3. fulcrum
        4. fulcrest
      9. sloped surface used to change the effort force & distance is __.
        1. ramp
        2. screw
        3. lever
        4. wedge
      10. A flag pole is an example of what type of simple machine?
        1. pulley
        2. wheel and axle
        3. gear
        4. screw
      11. A door knob is an example of __.
        1. lever
        2. wheel and axle
        3. pulley
        4. screw
      12. Does an object with energy always have momentum?
        1. yes
        2. no
      13. A staircase is an example of a __.
        1. inclined plane
        2. screw
        3. lever
        4. wedge
      14. A spiral staircase is an example of a __.
        1. wedge
        2. ramp
        3. screw
        4. ramp
      15. A stapler is __.
        1. a simple machine
        2. a compound machine
        3. a complex machine
        4. not a machine
      16. is the mechanical advantage without friction
        1. actual mechanical advantage
        2. ideal mechanical advantage
        3. geometric mechanical advantage
        4. realistic mechanical advantage
      17. inclined plane wrapped around a cylinder is called __.
        1. ramp
        2. screw
        3. wheel and axle
        4. pulley
      18. A broom is an example of what type of simple machine?
        1. lever
        2. ramp
        3. wedge
        4. inclined plane
      19. A job done slowly, and an identical job is done quickly.
        1. energy
        2. power
        3. both energy & power
        4. neither energy or power
      20. The amount of potential energy possessed by an elevated object is equal to __.
        1. the force needed to lift it
        2. the distance it is lifted
        3. the power used to lift it
        4. the work done to lift it
      21. Mini-blinds are examples of a __.
        1. wheel and axle
        2. pulley
        3. screw
        4. lever
      22. Work is defined as __.
        1. force times time
        2. force divided by time
        3. force times distance
        4. force divided by distance
      23. mechanical advantage based only on the geometry of the machine
        1. actual mechanical advantage
        2. ideal mechanical advantage
        3. geometric mechanical advantage
        4. realistic mechanical advantage
      24. A knife is an example of what type of simple machine?
        1. lever
        2. wedge
        3. gear
        4. ramp
      25. A diver on a 10 meter diving board has 10,000J of PE. After falling 7.5 meters the diver
        1. has 10,000 J KE
        2. has 7500 J KE
        3. has 5000 J KE
        4. has 2500 J KE
      26. . toothed wheel that fit together used to transfer energy/work/movement is called __
        1. pulley
        2. screw
        3. wheel and axle
        4. gear
      27. A door on a hinge is an example of __.
        1. inclined plane
        2. wheel and axle
        3. lever
        4. wedge
      28. Simple Machines do not change the direction of the effort force
        1. true
        2. false
      29. A diver on a 10 meter diving board has 10,000J of PE. After falling 10 meters the diver
        1. has 10,000 J KE
        2. has 7500 J KE
        3. has 5000 J KE
        4. has 0 J KE
      30. Which uses more work: lifting 50kg up 2meters or 25kg up 4meters?
        1. lifting the 50 kg object
        2. lifting the 25 kg object
        3. both require the same amount of work (W=Fd)
      31. ratio that tells you how many times the machine multiplies force you put into the machine
        1. actual mechanical advantage
        2. ideal mechanical advantage
        3. geometric mechanical advantage
        4. realistic mechanical advantage
      32. A nut cracker is an example of what type of simple machine?
        1. inclined plane
        2. wheel and axle
        3. gear
        4. lever
      33. the % of the work input that is converted to work output
        1. actual mechanical advantage
        2. ideal mechanical advantage
        3. efficiency
        4. accuracy
      34. A slanted road is an example of what type of simple machine?
        1. lever
        2. inclined plane
        3. wedge
        4. wheel and axle
      35. A diver on a 10 meter diving board has 10,000J of PE. After falling 5 meters the diver
        1. has 10,000 J PE
        2. has 7500 J PE
        3. has 5000 J PE
        4. has 0 J PE
      36. 2 inclined planes joined back to back is a __.
        1. ramp
        2. lever
        3. wedge
        4. wheel & axle
      37. A bow of a boat is an example of what type of simple machine?
        1. lever
        2. ramp
        3. wedge
        4. screw
      38. A zipper is an example of a __.
        1. wedge
        2. lever
        3. inclined plane
        4. screw
      39. Energy can never be created nor destroyed but it can be transformed from 1 type to another
        1. true
        2. false
      40. mechanical advantage that takes friction into consideration is _.
        1. actual mechanical advantage
        2. ideal mechanical advantage
        3. geometric mechanical advantage
        4. realistic mechanical advantage
      41. A lightbulb or jar lids are examples of what type of simple machine?
        1. wheel and axle
        2. pulley
        3. lever
        4. screw
      42. A diver on a 10 meter diving board has 10,000J of PE. After falling 7.5 meters the diver
        1. has 10,000 J PE
        2. has 7500 J PE
        3. has 5000 J PE
        4. has 2500 J PE
      43. Simple machines decrease the amount of work you do.
        1. true
        2. false
      44. another name for a combination pulley is a __.
        1. blocking pulley
        2. block and tackle
        3. fixed pulley
        4. movable pulley
      45. If you triple an object's velocity then the KE __.
        1. increases by a factor of 3
        2. decreases by a factor of 3
        3. increases by a factor of 6
        4. increases by a factor of 9
      46. A diver on a 10 meter diving board has 10,000J of PE. After falling 10 meters the diver
        1. has 10,000 J PE
        2. has 7500 J PE
        3. has 5000 J PE
        4. has 0 J PE
      47. the ratio of useful energy output to total energy input
        1. actual mechanical advantage
        2. ideal mechanical advantage
        3. efficiency
        4. accuracy
      48. rod or board that pivots is a __.
        1. lever
        2. ramp
        3. wheel and axle
        4. pulley
      49. If you double an object's velocity then the KE __.
        1. doubles
        2. halves
        3. quadruples
        4. remains the same
      50. A staple is an example of what type of simple machine?
        1. lever
        2. ramp
        3. wedge
        4. gear
      51. the total mechanical energy is equal to the sum of potential energy and kinetic energy
        1. true
        2. false
      52. A wheelbarrel is __.
        1. a simple machine
        2. a compound machine
        3. a complex machine
        4. not a machine
      53. Does an object with momentum always have energy?
        1. yes
        2. no
      54. The force that is placed on the simple machine to move the object is called _
        1. load
        2. output force
        3. effort force
        4. work
      55. some Energy is always transformed into heat & no machine can ever be 100% efficient
        1. true
        2. false

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