first moment of area

[ahmedbadr]

hello everey one actually i ve prob abt first moment of area i know how 2 calculate it but i cant get the physicsl meaning of it also i dont know whats difference between it and the second moment of area

[mathman]

The first moment is the center of mass (assuming uniform density). The second moment (around the center of mass) is called the moment of inertia - I suggest you look that up.