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Q: Moment of inertia is a concept applicable is case of:
  • A. A rotating body.
  • B. A body moving in straight line.
  • C. A body at rest.
  • D. Both (a) and (b).
Correct Answer: Option A - Moment of inertia shows the tendency of an object to stay in its state of rotatory motion. If an object has more mass, then it is more difficult to rotate it. Consider two spheres of the same radius, one made up of wood, and the iron. If the mass is transfer away from the axis, its moment of Inertia is greater.
A. Moment of inertia shows the tendency of an object to stay in its state of rotatory motion. If an object has more mass, then it is more difficult to rotate it. Consider two spheres of the same radius, one made up of wood, and the iron. If the mass is transfer away from the axis, its moment of Inertia is greater.

Explanations:

Moment of inertia shows the tendency of an object to stay in its state of rotatory motion. If an object has more mass, then it is more difficult to rotate it. Consider two spheres of the same radius, one made up of wood, and the iron. If the mass is transfer away from the axis, its moment of Inertia is greater.