09-September-2005, 03:28 PM
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Banned
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Join Date: Jun 2005
Location: St. Louis, USA
Posts: 537
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Quote:
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Originally Posted by RBG
Hey, I think I may have found a slight error or at least a significantly incomplete answer to the question:
#19: "Why does a wheel seem to move backwards as it speeds up?"
on the BA's 1996 MADSCI Q&A.
http://www.badastronomy.com/mad/1996/wheel.html
He rightly relates the phenomenon to the frame rate of film, but I'm surprised that there was no mention of this effect as seen in real life.
I always thought this was strictly a film-thing myself until I happened to see this a number of times, directly with my own eyes. No film.
Has anyone else seen this too? I'm sure it exists. And I would guess it is somehow caused by the number of spokes on the wheel in relation to the number of revolutions / minute.
Can anyone help me out here?
RBG |
It seems to happen in real life because light bulbs run on alternating current and 60 times a second a light bulb is actually turning off. The effect is more apparent in florescent light because those bulbs do not warm down like incandescent light bulbs.
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