oh oh
very cool set up iacopo,
even if the ball goes away , at least it creates a nice sound
I have a regular turntable 33 or 45 rpm
i wonder which speed would be most suitable for an experiment?
ciao for now
jim
Thank you, Jim. I am not sure about the optimal speed; in my case, it was difficult with the glass pane spinning fast, because I had to throw the ball without hitting with my hand the strings to which the pane was attached, but you don't have this problem, with the turntable. Maybe, also, the ball could slip towards the outside, if the speed is too high. On the other hand, I noticed that if the pane rotates too slowly, the ball also moves more slowly, and especially when the ball goes towards the center of the rotating plane, where the speeds are lowest, the ball at that point can stop to move completely and stand still, or it can move very slowly and a bit randomly in direction, because of the tiny irregularities of the surfaces, to which the ball is sensitive especially at the lowest speeds.
One interesting thing that I noticed is that, in the fourth sequence, the ball could make two revolutions staying at a side of the center of the glass pane, and in that situation the ratio between the rotational speed of the pane and that of the revolutions of the ball was about 7:2, as explained before in the thread. Intriguing.