Quiz  /  Rotational Inertia Class 9 MCQ Questions With Answers

  • 1. 
    Which object listed below has the greatest momentum?

  • A 0.05 kg object rolling at 0.2 m/s.
  • A 0.15 kg object rolling at 2 m/s.
  • A 0.15 kg object rolling at 1 m/s
  • A 0.4 kg object rolling at 2 m/s.

  • 2. 
    In translational motion, an objects inertia is determined by its ___________________ .

  • size
  • price
  • mass
  • position

  • 3. 
    At which point does the ball has the least gravitational potential energy (GPE)?

  • A
  • G
  • D
  • C

  • 4. 
    Work is ____________________ .

  • hard to find
  • boring
  • a change in the universe made by energy
  • never fun

  • 5. 
    Why is a choked-up batter easier to swing fast than one at the knob?

  • The bat distance from the center ( axis) of rotation is longer which decreases rotational inertia
  • The bat distance from the center (axis) of rotation is longer which increases RPMs
  • the bat distance from the center ( axis) of rotation is shorter which decreases rotational inertia
  • the bat distance from the center (axis) of rotation is longer which increases Torque

  • 6. 
    A push or a pull is called a

  • Gravity
  • Force

  • 7. 
    A ball on a string is spun around in a circle. Which of the following quantities is not constant?

  • mass
  • force
  • velocity
  • acceleration

  • 8. 
    A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,

  • her moment of inertia increases and her angular speed decreases.
  • her moment of inertia decreases and her angular speed increases.
  • her moment of inertia increases and her angular speed increases.
  • her moment of inertia increases and her angular speed remains the same.

  • 9. 
    If the radius of the string is .3 meters long and the stopper makes 5 revolutions per second, what is the speed of the stopper? (T = period = time for ONE revolution, not 5)

  • 9.4 m/s
  • 6.8 m/s
  • 11.7 m/s
  • 3.5 m/s

  • 10. 
    When this girl lets go of her string, what happens to the ball?

  • it flies straight due to law of inertia
  • it flies straight due to law of centripetal force
  • it curves due to rotational inertia
  • it curves due to its tangential speed

  • 11. 
    What's the centripetal acceleration of an object traveling 2.3 m/s around a circle of diameter 0.6 m?

  • 5 m/s2
  • 17.63 m/s2
  • 10 m/s2
  • 8.81 m/s2

  • 12. 
    Which forms of energy are present for objects rolling down an incline?

  • Gravitational potential energy
  • Rotational kinetic energy
  • Kinetic energy
  • All of above

  • 13. 
    The time required for one complete revolution is:

  • torque
  • frequency
  • period
  • rotational kinetic energy

  • 14. 
    Which has the bigger effect on Moment Of Inertia

  • Shape
  • Speed
  • Radius
  • Mass

  • 15. 
    Which of the following is the unit for centripetal force?

  • J
  • m/s2
  • kg⋅m/s
  • N

  • 16. 
    The number of complete revolutions per second is:

  • frequency
  • period
  • torque
  • rotational inertia

  • 17. 
    Which equation defines rotational kinetic energy?

  • K=1/2mw2
  • k=1/2Iw2
  • k=1/2Iv2
  • k=1/2mv2
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