Different rigid bodies have different values of the moment of inertia and hence different formulas to calculate it. Also, the Moment of Inertia in a body depends upon the axis of rotation. So here is a table of moment of inertia in different bodies depending upon the axis of rotation.
S.N | Rigid Body | axis of rotation | Moment of Inertia |
---|---|---|---|
1. | thin rod | perpendicular to its plane and passing through a center | ![]() |
2. | thin rod | perpendicular to its plane and passing through one end | ![]() |
3. | circular ring | perpendicular to its plane and passing through a center | ![]() |
4. | circular ring | about any diameter | ![]() |
5. | circular ring | in a plane about any tangent | ![]() |
6. | circular disk | perpendicular to its plane and passing through a center | ![]() |
7. | circular disk | about any diameter | ![]() |
8. | circular disk | about any tangent in a plane | ![]() |
9. | rectangular lamina | perpendicular to its plane and passing through its center | ![]() |
10 | rectangular lamina | axis along the edge of the length | ![]() |
11. | solid sphere | through its center | ![]() |
12. | solid sphere | about any tangent | ![]() |
13. | hollow sphere | through its center | ![]() |
14. | hollow sphere | about any tangent | ![]() |
15. | solid cylinder | about any symmetry axis | ![]() |
16. | hollow cylinder | about its axis | ![]() |