🎐 Barton's Pendulums 3D Physics Simulation: Resonance, Phase Lag and Driven Coupling (2D)

Barton's pendulums: a heavy driver pendulum swings on a shared rod and drives seven light paper pendulums of different lengths. Only the one with a matching length builds up a large swing, lagging the driver by 90 degrees. Change Q, coupling, gravity and the motor frequency and watch the resonance curve.