Centre of mass (discrete particles) (r_cm = Σ m_i r_i / M)
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r_cm = Σ m_i r_i / M
What each symbol means
| Symbol | What it stands for |
|---|---|
| M | Total mass Σ m_i (kg) |
| m_i | Mass of ith particle (kg) |
| r_i | Position vector from a chosen origin (m) |
When to use this
Inertial frame; same origin for all r_i. Extended bodies can be sliced into particles.