Adjust force, lever arm and angle to see how Torque (τ = r·F·sinθ) changes. Need >15 Nm to loosen the bolt.
Pull the skater's arms in to reduce Moment of Inertia (I). L = Iω stays constant — so ω increases!
Compare Sphere (k=0.4), Disc (k=0.5), Ring (k=1.0). Lower k = less rotational inertia = wins!