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Post by silverdragon on May 31, 2015 9:52:33 GMT
Take a speaker place it on its back, put a thin piece of plywood over it, then crank up the volume.
Does the plywood move?...
Internet search on Sound Levitation produces some interesting video
This is JUST one.....
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Post by silverdragon on May 31, 2015 9:58:48 GMT
Rewind to the beginning for interesting bits of science, and how it works.
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Post by the light works on Jun 1, 2015 17:04:24 GMT
catch here is differentiating between effects of the sound and effects of the vibration of the sound generating equipment.
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Post by c64 on Aug 4, 2015 22:07:41 GMT
This isn't anti gravity at all. If you call this anti gravity, all airplanes are anti-gravity devices as well. This is simply flying.
Here is a good video which explains how flowing air can make items fly:
Actually I was looking for a video how to make a ping pong ball fly on a jet of compressed air. I do that for over 30 years whenever I happen to have a ping pong ball and a compressed air gun available so I took this "trick" for granted. But I was unable to find any video on youtube. There are a few using a hair dryer but not a single one using a shop compressor and an air gun.
It all works the same way. The objects become "trapped" between a high-pressure and a low-pressure zone. Just like the wing of an airplane does, the difference is that a wing creates its own pressure difference while in the videos the pressure difference is either created by (standing) sound waves, a vacuum cleaner or - as I was taught by my grandpa - an air compressor.
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Post by c64 on Aug 4, 2015 22:25:22 GMT
I found one
This magic trick of the kid is simple. With some air guns, you can reach quite a distance between the nozzle and the ball. My personal record was just over 7 meters by hooking an old air gun to the 30 bar compressed air system of a research facility I once had worked in. But never, ever do that! The gun blew up after a while since it was only certified for a common 8-bar shop compressor. Fortunately, just the top blew off with the derbies flying away from me.
Using a common shop compressor and gun, you can still reach 1 meter easily, often as far as almost 2. It depends on the gun nozzle. The lower the flow of the gun at a given pressure, the better. So especially the old guns work well since they are designed for smaller compressor sizes than are common nowadays.
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Post by the light works on Aug 4, 2015 23:08:54 GMT
our regional science museum once had a model of that using a big blower and a basketball. it was impressive how well it self centered in the column of air.
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