Circular Motion

15 Questions  I  By 11reefeg
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Motion Quizzes & Trivia
Circular motion quiz.

  
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Questions and Answers

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  • 1. 
    Suppose you are at the center of a large freely rotating horizontal turntable in a carnival fun house. As you crawl toward the edge, the angular momentum of you and the turntable
    • A. 

      Decreases

    • B. 

      Increases

    • C. 

      Decreases in direct proportion to your decrease in RPMs

    • D. 

      Remains the same, but the RPM decrease


  • 2. 
    Since angular momentum is conserved in a rotating object,
    • A. 

      Speed decreases while mass is constant

    • B. 

      Speed decreases as mass decreases

    • C. 

      Speed increases as radial length decreases

    • D. 

      Speed increases as radial length increases


  • 3. 
    Toss a baseball bat into the air and it wobbles about its
    • A. 

      Center of mass

    • B. 

      Heavier end

    • C. 

      Geometrical center


  • 4. 
    If the polar icecaps melted, the resulting water would spread over the entire earth. The new mass distribution would tend to make the length of the day
    • A. 

      Shorter

    • B. 

      Longer

    • C. 

      Stay the same


  • 5. 
    A coin and a ring roll down an incline starting at the same time. The one to reach the bottom first will be the
    • A. 

      Ring

    • B. 

      Coin

    • C. 

      The one with the least mass

    • D. 

      Both will reach at the same time


  • 6. 
    A torque acting on an objct tend to produce
    • A. 

      Equilibrium

    • B. 

      Linear motion

    • C. 

      A center of gravity

    • D. 

      Rotation


  • 7. 
    On a balanced see-saw, a boy three times as heavy as his partner sits
    • A. 

      More than 1/3 the distance from the fulcrum

    • B. 

      Less than 1/3 the distance from the fulcrum

    • C. 

      1/3 the distance from the fulcrum


  • 8. 
    If you balance a broom horizontally on one finger, the center of gravity of the broom will be above your finger - closer to the bristles end than the handle end. If you saw the broom in two pieces at that point and weigh the two parts on a scale, you'll find that the lighter part is the
    • A. 

      Handle part

    • B. 

      Bristles part

    • C. 

      They have the same weight


  • 9. 
    A 1kg rock is suspended from the tip of a meter stick at the 0cm mark so that the meter stick balances like a see-saw when the fulcrum is at the 25cm mark. From this information what is the mass of the meter stick?
    • A. 

      1/2 kg

    • B. 

      1/4 kg

    • C. 

      1 kg

    • D. 

      3/4 kg

    • E. 

      More than 1 kg


  • 10. 
    Two people are balanced on a see-saw. If one person leans toward the center of the see-saw, that person's end will
    • A. 

      Fall

    • B. 

      Rise

    • C. 

      Stay the same


  • 11. 
    A tightrope walker more easily balances on a tightrope if his pole
    • A. 

      Is held high

    • B. 

      Droops (bends)

    • C. 

      Is short and light

    • D. 

      Is short and heavy


  • 12. 
    When doing somersaults, you'll more easily rotate when your body is
    • A. 

      Straight

    • B. 

      Balled up

    • C. 

      No difference


  • 13. 
    The famous leaning tower of pisa doesn't topple over because its center of gravity is
    • A. 

      Displaced from its center

    • B. 

      In the same place as its center of mass

    • C. 

      Above a place of support

    • D. 

      Relatively low for such a tall building


  • 14. 
    As centrifugal force increases
    • A. 

      Centripetal force decreases

    • B. 

      Centripetal force increases

    • C. 

      Centripetal force must be constant

    • D. 

      Center of mass increases


  • 15. 
    To turn a stubborn screw, it is best to use a screwdriver that has a
    • A. 

      Wide handle

    • B. 

      Long handle

    • C. 

      Yellow color

    • D. 

      None of these


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