If you don’t rotate an object around its Center of Mass, you introduce instability, vibrations, extra stress, and sometimes complete system failure.
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- #2492
- 12 Sep 2025
What Is the Center of Mass?
The center of mass is the point in an object where its mass is evenly distributed in all directions. It’s the point where an object naturally balances.
For uniform, symmetrical objects, the center of mass is at the geometric center.
For irregular objects, it depends on the mass distribution.
When you rotate an object about its Center of Mass:
The object spins in place without wobbling.
The angular motion is pure rotation (no unintended linear motion).
No unbalanced forces are trying to move the object off its axis.
Rotating Away from Center of Mass causes:
Wobbling and erratic motion.
The object’s Center of Mass traces a circular path — causing unwanted vibrations.
High stresses on mounts, motors, or axles.
Real-World Applications:
Drones — Must rotate evenly for stable flight.
Washing Machines — Balanced drum avoids violent shaking.
Satellites — Precise control of orientation depends on the Center of Mass spin.
Engines & Turbines — Reduce vibration and extend lifespan.
Robots — Predictable motion for arms and wheels.