Second moment of area facts for kids
The moment of force (also called the first moment of force) about any point is the product of the force and perpendicular distance between them. If this first moment is again multiplied by the perpendicular distance between them, the product so obtained is called the second moment of force or moment of moment of the force. If instead of force, the area of the figure or mass of the body is considered, it is called the second moment of area or second moment of mass. They are also termed broadly as moments of inerta.
There is no physical significance for moment of inertia. It is just a mathematical expression usually denoted by 
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In Spanish: Segundo momento de área para niños
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Second moment of area Facts for Kids. Kiddle Encyclopedia.