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Strobe light makes water drops fall in slow motion





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Uploaded on Jun 22, 2010

Using a reciprocating pump and a strobe light, we can make water drops appear to fall down (or up) in slow motion. This illusion is due to the periodic nature of the pump: each droplet forced out of the tube is almost identical to the preceding droplet so our eyes perceive the droplets moving slowly rather than falling quickly. You also can freeze-frame this video and use the ruler to make a crude measurement of the acceleration of gravity. Read more at

You can find out how the strobe makes the droplets appear to fall in slow motion by watching this video

You can learn more about Doc Harold Edgerton, the man who created both the strobe and this illusion, from this video

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