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What is the Moment of Inertia
Submitted by M. abdelWahab <abdelwahab@science4000.com> on 11/Jan/2010
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According to Newton's first law of motion, a body must continue in its state of rest or uniform motion unless compelled by some external force. The inability of a material body to change its state by itself is called inertia. Inertia is the fundamental property of matter. In translatory motion, the mass of a body measures the coefficient of inertia.
Similarly, in rotatory motion, a body which is free to rotate about a given axis, opposes any change in its state. The measure of opposition will depend on the mass of the body and the distribution of mass about the axis of rotation. The coefficient of inertia in rotary motion is called the moment of inertia of the body about the given axis. Moment of inertia plays the same role in rotary motion as that of mass in translatory motion.
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