Two bodies of mass $1 K g$ and $2 K g$ are attached to the ends of a $2 m e t e r$ long weight less rod. This system is rotating about an axis passing through a middle point of the rod. Calculate $M . I .$ of system.

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Solution

Moment of inertia(MOI) of point mass, $I = m l^{2}$
$\Rightarrow M O I = 1 \times 1^{2} + 2 \times 1^{2} = 3 K g . m^{2}$

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