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what is physical significance of moment of inertia?

Moment of inertia of a point mass w.r.t. an axis of rotation is defined as the product of the mass and the square of the distance from the axis.

 

Moment of inertia, I = mr2

Moment of inertia is the rotational analog of mass in linear motion. Moment of inertia of a rotating body offers the resistance to the rotational motion.

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e.g

a person tends to fall in the direction in which a fast moving bus is directed....

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moment of inertia is the rotational equivalent of mass. it is given by I= Mk2

moment of inertia in rotational motion play the same role as mass in linear motion, that is in linear motion f = ma while in rotation, torque= I*Angular acceleration where I is the moment of inertia

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