Discussion
Match each section property in List I with what it governs in List II.
List I
A. Second moment of area
B. Product of inertia
C. Centroid
D. Shear centre
List II
1. Where the neutral axis passes
2. Bending stiffness about a given axis
3. Whether a transverse load also twists the section
4. Coupling between the two bending planes
Select the correct match.
Answer: B
The four properties answer different questions, and confusing the centroid with the shear centre is the commonest error. Bending is governed by the centroid and the second moments; twisting under a transverse load is governed by the shear centre.
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