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Flywheel

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1. What is the moment of inertia?

  • The distance from the center of mass to the pivot point
  • The force required to stop a rotating object
  • The speed of rotation of an object
  • The property by which a body resists changes in its rotational motion about an axis

2. Which of the following expressions correctly defines the moment of inertia?

  • I = ∑miri²
  • I = mv²
  • I = F × r
  • I = mr

3. What is the physical significance of moment of inertia?

  • It defines how much torque is required to rotate or stop an object
  • It determines how fast an object moves linearly
  • It measures the mass of an object
  • It replaces torque in the equation of motion

4. What is the radius of gyration?

  • The maximum radius of the object
  • The radius of a circle with the same area as the object
  • The radius of a disc spinning at maximum velocity
  • The distance from the axis where all mass can be concentrated to produce the same moment of inertia

5. Which of the following best defines the Theorem of Parallel Axes?

  • I = M × r × v
  • I = Icm + Ma², where Icm is moment of inertia about center of mass axis
  • I = Icm − Ma²
  • The moment of inertia of any axis is the difference between two perpendicular axes

6. What does the Theorem of Perpendicular Axes state?

  • Iz = Ix + Iy for a 3D body
  • Ix = Iy = 0 for symmetric objects
  • Iz = Ix + Iy for a planar body
  • Iz = Ix − Iy for a solid sphere

7. What principle does a flywheel operate on?

  • Newton’s third law of motion
  • Law of inertia
  • Conservation of mass
  • Conservation of angular momentum and kinetic energy storage

8. What is the role of the crank in a flywheel system?

  • To support the flywheel's structure
  • To store energy in the flywheel
  • To stop the flywheel from rotating
  • To apply torque and cause the flywheel to rotate

9. What is the function of the shaft in a flywheel setup?

  • It stores compressed air for the flywheel
  • It acts as a brake for the flywheel
  • It generates energy for the system
  • It serves as the axis on which the flywheel rotates

10. How does a flywheel store energy?

  • By converting electrical energy into light
  • By increasing its temperature
  • By compressing gas inside a cylinder
  • By spinning a mass at high speed to store kinetic energy

11. What is one practical use of a flywheel in stationary engines?

  • To smooth out the motion by storing and releasing energy
  • To measure fuel efficiency
  • To control engine temperature
  • To reduce the weight of the engine