Similarly, torque is required to change the rotational state of motion of an object. The greater an object’s rotational inertia, the more difficult it is to change the rotational speed of the object.Ī force is required to change the linear state of motion of an object. This resistance is called rotational inertia (or the moment of inertia). Rotating objects tend to continue their rotating condition and non-rotating objects tend to remain non-rotating.Īn object resists changes in its rotational motion status. When an object is rotating about an internal axis, the object tends to keep rotating about that axis. This law applies to rotating objects as well. Here comes Newton’s first law which is also called the law of inertia. If we try to find out the equivalent of linear inertia for the rotational motion then we get the notion of Rotational Inertia. And you know, this mass is the determining factor of inertia (property of an object to retain its state of motion – when either it’s moving linearly or in static condition), that’s why mass is also called inertia for linear motion. Linear momentum or simply momentum is a product of mass and linear velocity. Inertia versus Moment of Inertia | Compare Inertia and Moment of Inertia
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