Parallel axis theorem (I = I_cm + M d²)
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I = I_cm + M d²
What each symbol means
| Symbol | What it stands for |
|---|---|
| I | MOI about new parallel axis |
| M | Total mass |
| d | Perpendicular distance between the two parallel axes |
| I_cm | MOI about parallel axis through COM |
When to use this
Axes must be parallel; I_cm is about COM of same body.