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PolskiFoucault Pendulum (2D Top-Down)
A top-down 2D companion to the 3D Foucault pendulum: the swing plane stays fixed while the compass floor turns beneath it at the real Earth-rotation precession rate.
This 2D companion keeps the same physics as the 3D original: a pendulum bob swings in a plane that stays fixed in inertial space, while the floor beneath it — drawn here as a compass disc seen from directly above — turns at the real Foucault precession rate ω = ΩEarth·sin(latitude). Drag the Latitude slider toward the poles to see the floor spin faster under the fixed swing plane, or toward the equator to watch the precession vanish entirely.
SHM pendulum (θ(t) = θ₀·cos(ωt)) swinging in a fixed world-space plane; the floor's rotation rate is the literal Coriolis-derived Foucault formula, not an arbitrary speed slider, with a Time scale control to make the very slow real rate visible.
2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install