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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 http://people.cornellcollege.edu/dshe...

You can find out how the strobe makes the droplets appear to fall in slow motion by watching this video http://www.youtube.com/watch?v=D1LnyS...

You can learn more about Doc Harold Edgerton, the man who created both the strobe and this illusion, from this video https://www.youtube.com/watch?v=FlNc5...

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