Statics › Section J · Moments of inertia › Topic J.7
Products of inertia and mass moment of inertia
Two last ideas complete the course's picture of inertia. The product of inertia shows when an unsymmetrical section will bend at an angle, and the mass moment of inertia connects these flat-area tools to real spinning bodies.
In this topic
- When the axes are not enough
- The product of inertia
- Symmetry makes it vanish
- Moving the axes
- Worked example: a rectangle and a triangle
- Principal axes
- Worked example: an angle section
- The mass moment of inertia
- Worked example: a thin steel plate
- Common mistakes to avoid
- Key takeaways
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