Evals / Physics

Actual physics: torque through tooth contact

Rapier world with gravity and a floor. The motor case is a free body resting on a stand — nothing is bolted to the world. Tooth colliders are convex hulls of the real LDraw tooth geometry, so the collision shape matches what you see. The DC-motor model torques the 8t only (its reaction torque pushes back on the case); the 24t turns because teeth push teeth. The ratio is measured from the bodies, not scripted.