Conceptual Physics: Questions On Rotational Motion

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Conceptual Physics: Questions On Rotational Motion - Quiz

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Questions and Answers
  • 1. 
    Horses that move with the fastest linear speed on a merry-go-round are located
    • A. 

      Near the center

    • B. 

      Near the outside

    • C. 

      Anywhere, because they all move at the same speed

  • 2. 
    Your pet hamster sits on a record player whose angular speed is constant. If he moves to a point twice as far from the center, then his linear speed
    • A. 

      Doubles

    • B. 

      Halves

    • C. 

      Remains the same

  • 3. 
    Since each rolling wheel of a railroad train is tapered, the narrow part of the wheel has a tangential speed that is
    • A. 

      Greater than that of the wide part

    • B. 

      Smaller than that of the wide part

    • C. 

      The same as that of the wide part

  • 4. 
    When a train makes a curve, different parts of the wheel rims
    • A. 

      Cover a different distance in the same time

    • B. 

      Must all expand at the same time

    • C. 

      Must all contract at the same time

    • D. 

      Vibrate at different rates

  • 5. 
    The tapered shape of the parts of the wheels that ride on railroad tracks allows opposite wheels to
    • A. 

      In effect, vary their diameters

    • B. 

      Travel at different linear speeds for the same rotational speed

    • C. 

      Both A and B are correct

  • 6. 
    Which moves faster in m/s on a merry-go-round: a horse on the inside or a horse on the outside near the outer rail?
    • A. 

      Inside horse

    • B. 

      Outside horse

    • C. 

      Both move at the same speed in m/s

  • 7. 
    If a turntable's rotational speed is doubled, then the linear speed of a pet hamster sitting on the edge of the record will
    • A. 

      Double

    • B. 

      Double

    • C. 

      Remain the same

  • 8. 
    Suppose the circumference of a bicycle wheel is 2 meters. If it rotates at 1 revolution per second when you are riding the bicycle, then your speed will be
    • A. 

      1 m/s

    • B. 

      2 m/s

    • C. 

      3 m/s

    • D. 

      3.14 m/s

    • E. 

      6.28 m/s

  • 9. 
    Consider a string with several rocks tied along its length at equally spaced intervals. You whirl the string overhead so that the rocks follow circular paths. Compared to a rock in the middle of the string, a rock at the outer end moves
    • A. 

      Half as fast

    • B. 

      Twice as fast

    • C. 

      At the same linear speed

  • 10. 
    A broom is easier to balance on its end when the heavier end (the brush end) is
    • A. 

      Nearest your hand

    • B. 

      Highest, farthest from your hand

    • C. 

      Same either way

  • 11. 
    An industrial flywheel has a greater rotational inertia when most of its mass is
    • A. 

      Nearest the rim

    • B. 

      Nearest the axis

    • C. 

      Uniformly spread out as in a disk

  • 12. 
    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. 

      Both reach the bottom at the same time

  • 13. 
    The rotational inertia of your leg is greater when your leg is
    • A. 

      Straight

    • B. 

      Bent

    • C. 

      Same either way

  • 14. 
    A torque acting on an object tends to produce
    • A. 

      Equilibrium

    • B. 

      Rotation

    • C. 

      Linear motion

    • D. 

      Velocity

    • E. 

      A center of gravity

  • 15. 
    On a balanced seesaw, a boy three times as heavy as his partner sits
    • A. 

      1/3 the distance from the fulcrum

    • B. 

      Less than 1/3 the distance from the fulcrum

    • C. 

      More than 1/3 the distance from the fulcrum

  • 16. 
    Put a pipe over the end of a wrench when trying to turn a stubborn nut on a bolt, to effectively make the wrench handle twice as long, you'll multiply the torque by
    • A. 

      Two

    • B. 

      Four

    • C. 

      Eight

  • 17. 
    Toss a baseball bat into the air and it wobbles about its
    • A. 

      Geometrical center

    • B. 

      Center of mass

    • C. 

      Heavier end

  • 18. 
    The long, heavy tail of a spider monkey enables the monkey to easily vary its
    • A. 

      Weight

    • B. 

      Momentum

    • C. 

      Inertia

    • D. 

      Center of gravity

    • E. 

      None of these

  • 19. 
    The center of mass of a human body is located at a point
    • A. 

      That is fixed, but different for different people

    • B. 

      That is always directly behind the belly button

    • C. 

      That changes as a person bends over

    • D. 

      None of these

  • 20. 
    The famous Leaning Tower of Pisa doesn't topple over because its center of gravity is
    • A. 

      Above a place of support.

    • B. 

      Relatively low for such a tall building.

    • C. 

      Stabilized by its structure.

    • D. 

      Displaced from its center.

    • E. 

      In the same place as its center of mass.

  • 21. 
    The chef at the infamous Fattening Tower of Pizza tosses a spinning disk of uncooked pizza dough into the air. The disk's diameter increases during the flight, while its rotational speed
    • A. 

      Remains constant.

    • B. 

      Increases.

    • C. 

      Decreases.

  • 22. 
    Centrifugal forces are an apparent reality to observers in a reference frame that is
    • A. 

      Moving at constant velocity.

    • B. 

      An inertial reference frame.

    • C. 

      At rest.

    • D. 

      Rotating.

    • E. 

      None of these

  • 23. 
    A person weighs less at the equator than at the poles. The main reason for this has to do with
    • A. 

      The spin of the Earth.

    • B. 

      The shape of the Earth.

    • C. 

      The influence of the sun, moon, and all the planets.

    • D. 

      The law of action and reaction.

  • 24. 
    When a twirling ice skater brings her arms inward, her rotational speed
    • A. 

      Increases.

    • B. 

      Decreases.

    • C. 

      Remains the same.

  • 25. 
    Consider a rotating donut-shaped space habitat where living quarters are on the inside surface farthest from the axis. If the rotational speed of the habitat increases, the apparent weight of people inside
    • A. 

      Increases.

    • B. 

      Decreases.

    • C. 

      Stays the same.

    • D. 

      Is always zero.

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