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Re: [Phys-L] spinner data -- experimentation 101



Oh my!
Something fishy with discontinuities in the periods of the spinner rotation.
I wonder how the periods were calculated?
  Could it have been the difference of successive  three digit rates divided by the difference of successive two or three digit times?

So could it be a quantization processing issue?

I mention this, because in simulation of dynamic quantities, the rule of thumb is 'differentiation is bad, and integration is good'. The one magnifies errors, the other smooths them.

Brian W


On 9/19/2017 5:53 AM, John Denker via Phys-l wrote: /in part/
/snip/ The period exhibits gradual
smooth changes and then there's a jump. Then some more smooth
changes and another jump:
https://www.av8n.com/physics/img48/fidget-spinner-period-residuals.png

/snip/
Because of the jumps, I don't trust this fit farther than
I could throw it. And it's bad manners to throw a fit.

This shows why experimentation is iterative: Do a preliminary
experiment, find out what the problems are, then try again.