Quiz #5: Work, Power And Energy

10 Questions | Total Attempts: 577

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Work And Energy Quizzes & Trivia

You may take this quiz 3 times. I will keep your best score.


Questions and Answers
  • 1. 
    If a mass is at rest, what must be applied to cause it to move?
    • A. 

      Kilograms

    • B. 

      Speed

    • C. 

      Vectors

    • D. 

      Force

  • 2. 
    If you push on a wall with a force of 30 N, then ______________.
    • A. 

      The wall pushes on you with a force of 30 N.

    • B. 

      The wall moves back 3 cm.

    • C. 

      The wall cannot be forced.

    • D. 

      You are pulled towards the wall.

  • 3. 
    If you have to push a car forward, what are the forces acting on you?
    • A. 

      The car pushes back on you, gravity pulls you down, the ground pushes up on you, and friction on your shoes pushes forward on you.

    • B. 

      Only gravity.

    • C. 

      Your own muscles push you down.

    • D. 

      No forces act on you.

  • 4. 
    A person jumps to the ground from a platform 10 feet high.  Which of the following is true?
    • A. 

      The person has more kinetic energy before they jump than after they jump.

    • B. 

      The person has less potential energy at the top of the platform than in the air.

    • C. 

      The person's potential energy at the instant they jump is approximately equal to their kinetic energy the instant they land.

    • D. 

      The person's kinetic energy at the instant they jump is approximately double their potential energy the instant they land.

  • 5. 
    The potential energy of an object is equal to ____________.
    • A. 

      The work done on the object to put the object into its current state.

    • B. 

      The velocity of the object divided by its mass.

    • C. 

      The force of gravity working on the object.

    • D. 

      The size of the object compared to its surface area.

  • 6. 
    The kinetic energy of an object will increase the most if you __________________.
    • A. 

      Double the velocity of the object

    • B. 

      Double the mass of the object

    • C. 

      Double the potential energy

    • D. 

      Double the temperature of the object

  • 7. 
    "Power" is defined as _________________.
    • A. 

      The rate at which work is done

    • B. 

      The energy necessary to do work

    • C. 

      The velocity of an object squared

    • D. 

      The sum of potential and kinetic energy

  • 8. 
    An object with mass "m" kilograms is suspended "h" meters above the ground by a string.  If the string is cut, what will the velocity of the object be at the instant it hits the ground?
    • A. 

      The square root of 2gh

    • B. 

      One-half the mass squared

    • C. 

      Two times ghm squared

    • D. 

      H-2gm

  • 9. 
    Which of the following is NOT a consequence of "The Law of Conservation of Energy"?
    • A. 

      Potential Energy can never be greater than Kinetic Energy

    • B. 

      The energy in a closed system is always constant

    • C. 

      The Kinetic Energy of a dropped object at the instant it hits the ground is roughly equal to the potential energy of the object at the instant it was dropped

    • D. 

      It is not necessary to use Kinematics to discover the velocity of an object accelerated by gravity if you know it's initial Potential Energy and its mass.

  • 10. 
    As an object goes up a hill at constant velocity, which of the following is NOT true?
    • A. 

      The object's Potential Energy is increasing.

    • B. 

      The object's Kinetic Energy is decreasing.

    • C. 

      The object's Kinetic Energy is constant.

    • D. 

      The object's speed is constant.