Inertia is the property of an object to resist changes in its state of motion, remaining at rest or in uniform motion.
Class 11 Physics
Systems of Particle & Rotational Motion
CBSE EXAM 2024-25
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The moment of inertia is a property that tells us how a rotating object resists the change in angular acceleration. The theoretical background assumes mass, the distribution of this mass relative to the axis, and the selected axis itself for the three parameters. The mass and how far away from the axis it lies give an object a higher moment of inertia. For instance, a hollow ring has a greater moment of inertia than an equivalent solid disc of the same mass and radius because its mass is distributed further from the axis. However, the moment of inertia is independent of the angular velocity of the object. Angular velocity explains how fast an object is spinning, but this does not contribute to the intrinsic resistance to its rotation. It means that irrespective of whether it is spinning rapidly or slowly, the moment of inertia remains unchanged because it only depends on its physical structure and the axis about which it rotates.
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