🌀 Spring-Slinky — 2D Slinky Drop and Collapse Wave

2D companion of the spring-slinky sim: a 40-mass zero-length-spring chain hung from its top end and released, with tension profile, per-end fall graphs, centre-of-mass free fall and a collapse-time check against sqrt(M/K).

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