I like that you also have the ball sliding when the initial part of the track is near vertical. My German isn't good enough to read easily - is there a way of

I like that you also have the ball sliding when the initial part of the track is near vertical. My German isn't good enough to read easily - is there a way of varying the coefficient of friction? Setting that 0 simulates the traditional problem where the falling object slides, and setting it to a very high value gets closer to the situation where some of the energy is taken into the rolling, and not into the speed of the ball. But nice work - thank you.