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🔮 Double Pendulum Simulation (2D)

Interactive 2D double pendulum simulation: real Lagrangian equations of motion, RK4-integrated, showing chaotic motion. Drag to set the initial angle, add a nearly-identical twin pendulum, and watch the butterfly effect unfold in real time.

Chaos & Dynamics2DModerate60 FPS📱 Mobile-adapted⇄ 3D version

Details

CategoryChaos & Dynamics

RenderingCanvas 2D

DifficultyModerate

Target FPS60

ControlsLength L1 slider, Length L2 slider, Mass m1 slider, Mass m2 slider, Initial angle theta1 slider, Initial angle theta2 slider, Gravity slider, Damping slider, Speed slider, Trail length slider, Drag bobs to set angle, Twin mode toggle, Pause/Play, Reset, Clear Trail

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⚙ Under the hood

Interactive 2D double pendulum simulation built on real coupled Lagrangian equations of motion, integrated with RK4 for accurate, energy-conserving chaos. Drag the bobs to set the starting angles, then enable Twin mode to launch a second nearly-identical pendulum and watch the two paths diverge exponentially — the classic signature of deterministic chaos.

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2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install