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Here is what I mean by galilean cannon, simply letting balls fall, but hard to experiment though... First, I tried to drop 2 balls with my hands, but balls do not rebound straight and I get enormous uncertainty... I tried then to drill them which works but my rebounding balls lose a lot of "rebounding power" which falsify my results

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    $\begingroup$ There are two things deforming to make a rebound- the floor and the ball. If the rebound is not straight, that just indicates an asymmetry somewhere (which to some degree can't be avoided) so what can you do to make it more symmetric? $\endgroup$
    – Abel
    Commented Oct 26, 2023 at 10:49
  • $\begingroup$ The asymmetry comes from the axis of the balls. The balls have to be on the same axis, otherwise they won't rebound straight. That's why drill them and then aline them with a thread works perfectly, but it decreases the "rebouding power" of the balls $\endgroup$
    – Dlouna.J
    Commented Oct 26, 2023 at 11:36
  • $\begingroup$ A perfectly flat floor is needed - do you have one? And when you let go do your hands inadvertently impart a spin to the ball? Ever played snooker? $\endgroup$
    – Solar Mike
    Commented Oct 26, 2023 at 12:26
  • $\begingroup$ What about all the balls the same size but hollow to give different masses? then a tube... $\endgroup$
    – Solar Mike
    Commented Oct 26, 2023 at 12:27
  • $\begingroup$ Yes, but then balls do have the same composition and "rebounding power". I tried a Tube too, Wich sometimes works well, but the problem still the same. The balls have to fall and rebound straight to neglect friction $\endgroup$
    – Dlouna.J
    Commented Oct 26, 2023 at 13:41

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