Home▸Physics & Mechanics▸Spool Pulled by a Thread - 2D Physics Simulation of Torque and the Critical Pull Angle

🧵 Spool Pulled by a Thread - 2D Physics Simulation of Torque and the Critical Pull Angle

2D side-view simulation of a spool pulled by a thread: rolling toward or away from the puller, critical angle arccos(r/R), friction limit and energy balance with live graphs.

Physics & Mechanics2DModerate60 FPS📱 Mobile-adapted⇄ 3D version

⚙ Under the hood

2D side-view companion of the spool and thread lab: rolling toward or away from the puller, critical angle arccos(r/R), friction limit and live graphs.

TorqueRolling MotionFrictionClassical MechanicsCanvas

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