Physics > Basics of Rotational Motion > 6.0 Theorems of moment of inertia

  Basics of Rotational Motion
    1.0 Rigid body
    2.0 Motion of rigid body
    3.0 Kinematics of a plane motion
    4.0 Moment of inertia
    5.0 Radius of gyration $(K)$
    6.0 Theorems of moment of inertia
    7.0 Moment of inertia of uniform continious rigid bodies

6.2 Perpendicular axis theorem
The moment of inertia of a planar lamina about an axis $\left( {{I_z}} \right)$ perpendicular to its plane is equal to the sum of the moment of inertia about two perpendicular axes $\left( {{I_x}\;\& \;{I_y}} \right)$ in the plane of the lamina and passes through the point of intersection $(POI)$ of these two axes.

Mathematically, $${I_z} = {I_x} + {I_y}$$
where,
${I_x}$: Axis perpendicular to the plane
$\left( {{I_x}\;\& \;{I_y}} \right)$: Two perpendicular axes in the plane of the rectangular lamina

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