Moment of inertia is the rotational analogue to mass. The moment of inertia must be specified with respect to a chosen axis of rotation. The symbols **Ixx**, **Iyy** and Izz are frequently used to express the moments of inertia of a 3D rigid body about its three axis.

Besides, what is 1st moment of inertia?

From Wikipedia, the free encyclopedia. The **first moment** of area, sometimes misnamed as the **first moment of inertia**, is based in the mathematical construct **moments** in metric spaces, stating that the **moment** of area equals the summation of area times distance to an axis [Σ(a × d)].

What is the unit of second moment of area?

The **second moment of area** is used to predict deflections in beams. It is denoted by I and is different for different cross sections, for example rectangular, circular, or cylindrical. The unit for this **measure** is length (in mm, cm, or inches) to the fourth power, i.e. mm^{4} or ft^{4}.

What is the moment of inertia of a beam?

"Area **Moment of Inertia**" is a property of shape that is used to predict deflection, bending and stress in **beams**. "Polar **Moment of Inertia**" as a measure of a **beam's** ability to resist torsion - which is required to calculate the twist of a **beam** subjected to torque.

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