Last edited by The Draykin; February 28th, 2008 at 15:03. Reason: mo.
Future member of the Brain Trust.
Ahoy! These are some video studies of bouncing balls. These items were shot originally on campus by myself, Astrid, and Alejandra but when I got home to edit, I found our shot was too far away (Framing is important! lol).
The timer counts seconds and then 30 frames per second, so 0;04;24 means 4 seconds and 24 frames (out of 30).
I analyzed the frames and noticed a few things about bounces.
The first is that a bouncing ball can be defined by the rate that it loses its height per bounce. In the case of a golf ball, it loses 1/6th of its height each bounce. The white numbers are measurements in pixels, just for relative measurement.
I also noticed that each bounce is a shorter segment of the same bounce. I think this is due to gravity and downward acceleration being the same between bounces, and among different objects.
I think this means that constructing a bounce is a matter of reducing an arc by the same fraction each time.
Here is the bowling ball bouncing approximately 50% lower each time
Basketball bouncing 10% lower each time
The ping pong ball is a little different, and it wasn't as consistent as the other balls. I think it's due to air resistance and being very light. Maybe there's less time for air resistance to act on it in the smaller bounces, so it loses less height.
This is the ping pong ball also repeating the same arc between bounces.