Understanding Moment of Inertia and Bending Stress in Physics Forums

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SUMMARY

The discussion focuses on the moment of inertia and its application in calculating bending stress. The user, Falah Alajmi, seeks clarification on the correct formulas for moment of inertia for rectangular sections, specifically 1/3 bh^3 and 1/12 bh^3. The distinction is made between using these formulas based on whether the neutral axis passes through the centroid or not. The user expresses uncertainty about determining the position of the neutral axis relative to the center of gravity.

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falah alajmi
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hi all ,

I am a new member in physics forums and I hope I can help and get benefit from this forums .

I would ask anyone knows about the moment of inertia cos i have not study it before and I have to know it to solve a bending stress problem ..

when I used the moment of inertia for rectangle as 1/3 bh^3 and when I use it as 1/12 bh^3

as I now I use the first one when the neutral axises pass through the centroid and the second one when it not pass through the centroid .. but how can I know if the neutral axises pass through the centre of gravity or not ?


sincerely
falah alajmi
 
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