Work, Power And Machines Trivia Quiz!

20 Questions | Total Attempts: 138

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Work, Power And Machines Trivia Quiz! - Quiz

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Questions and Answers
  • 1. 
    A leaf rake makes work easier by increasing the output force.
    • A. 

      True

    • B. 

      False

  • 2. 
    You push on an object for 5 seconds.  During those 5 seconds, the object moves 0.87 m.  After you stop pushing, the object moves another 0.30 m.  The distance you should use to calculate work is ____________. 
  • 3. 
    Kinetic and potential energy increase when you lift something in the air.
    • A. 

      True

    • B. 

      False

  • 4. 
    The formula to calculate power is work times distance.
    • A. 

      True

    • B. 

      False

  • 5. 
    Work can occur without motion.
    • A. 

      True

    • B. 

      False

  • 6. 
    A machine converts input work into output work.
    • A. 

      True

    • B. 

      False

  • 7. 
    One way a machine can make work easier is to change the direction of the force.
    • A. 

      True

    • B. 

      False

  • 8. 
    A machine that has an output force that is equal to the input force has a mechanical advantage of less than one.
    • A. 

      True

    • B. 

      False

  • 9. 
    What does a machine do to the amount of work that needs to be done?
    • A. 

      Decreases it

    • B. 

      Increases it

    • C. 

      Keeps it the same

    • D. 

      Eliminates it

  • 10. 
    According to scientists, which of the following are considered work?
    • A. 

      Reading

    • B. 

      Studying

    • C. 

      Lifting weights

    • D. 

      Moving a bookshelf

  • 11. 
    Work is done to lift an object off of the ground.
    • A. 

      True

    • B. 

      False

  • 12. 
    The efficiency of a machine is also a measure of 
    • A. 

      Friction

    • B. 

      Accuracy

    • C. 

      Work

    • D. 

      Energy

  • 13. 
    Only the part of a force that acts in the direction of motion does work.
    • A. 

      True

    • B. 

      False

  • 14. 
    Moving something faster changes the amount of work done on the object in comparison to moving it in the same distance at a slower speed.
    • A. 

      True

    • B. 

      False

  • 15. 
    The work done to lift an object off the ground is equal to the mass of the object multiplied by the distance it is lifted.
    • A. 

      True

    • B. 

      False

  • 16. 
    Calculate the power used to move an object 3.0 m using 2 N of force over 2.5 seconds. (Hint: find work, then power) Work = Force x distance Power = Work/time
    • A. 

      6 W

    • B. 

      5 W

    • C. 

      15 W

    • D. 

      2.4 W

  • 17. 
    Pamela uses a nutcracker to break an walnut.  She applies a force of 24 N on the nutcracker.  The force exerted on the almond is 60 N.  Calculate the mechanical advantage of the nutcracker.MA = output force/input force
    • A. 

      2.5

    • B. 

      0.4

    • C. 

      1,440

    • D. 

      6

  • 18. 
    You push on an object for 4 seconds with a force of 3 N.  During those 4 seconds, the object moves 0.85 m.  After you stop pushing, the object moves another 0.10 m.  Calculate the work done on the object.  Work = Force x distance
    • A. 

      3.4 J

    • B. 

      2.55 J

    • C. 

      2.85 J

    • D. 

      3.8 J

  • 19. 
    Ross does 30 J of work with a lever.  The output work of the elver is 25 J.  Calculate the efficiency of the lever.Efficiency = output work/input work x 100
    • A. 

      12%

    • B. 

      8.3%

    • C. 

      83%

    • D. 

      120%

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