Center of mass: three particles

Move the particles. Change their masses. Where is the center of mass?

Drag any particle

Equal scales on both axes

Tab to a particle and use the arrow keys to move it. Hold Shift for larger steps.

Coordinates (x, y) in metres

Total mass:

Particle	Mass (kg)	x (m)	y (m)

The circles mark point particles; their drawn sizes do not represent physical sizes.

Show center of massShow calculationSnap to 0.5 m grid

Keys: R reset exercise · H hide or show controls · T light or dark · F11 full screen. Masses: 0.1-50 kg. Positions: -1 to 6 m.