Rugby Scrum Engagement Physics

Two packs of forwards crouch, bind and hit — this simulator models the two distinct phases of a real rugby scrum: the initial collision, resolved as a perfectly inelastic momentum exchange, and the sustained drive that follows, where each pack's steady push force fights the other pack's force and ground friction under Newton's second law. Set each pack's drive power and the pitch's friction coefficient, hit Engage, and watch the live force balance, combined scrum velocity and ground gained decide who wins the put-in.