Moment of inertia

Moment of inertia is a physical quantity that measures how difficult it is to change the rotational motion of an object. It depends on both the mass of the object and how that mass is distributed relative to the axis of rotation. Objects with more mass concentrated far from the rotation axis have a higher moment of inertia, making them harder to spin or stop. It's similar to how heavier objects are harder to push; in rotation, the distribution and amount of mass play a crucial role in determining how easily an object can be rotated.