Rugby Scrum Engagement Physics (2D)

Two packs of forwards crouch, bind and hit — this 2D companion models the same two phases of a real rugby scrum as the 3D version: the initial collision, resolved as a perfectly inelastic momentum exchange, and the sustained drive that follows, where each pack's push force fights the other pack's force and ground friction under Newton's second law. Instead of setting a fixed drive power directly, here you set each pack's mass, technique factor and the closing speed at engagement — hit Engage, and watch the live force balance, combined scrum velocity and ground gained decide who wins the put-in.