Motion of centre of mass (F_ext = M a_cm)
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F_ext = M a_cm
What each symbol means
| Symbol | What it stands for |
|---|---|
| M | Total mass of the system (kg) |
| a_cm | Acceleration of centre of mass (m/s²) |
| F_ext | Vector sum of external forces on the system (N) |
When to use this
Valid for any system of particles; internal forces cancel in pairs (Newton III).