xanthic Posted April 14, 2013 Share Posted April 14, 2013 Seeing the pendulums reminded me of another wave trick - https://www.youtube.com/watch?v=uENITui5_jU&feature=youtube_gdata_player Link to comment Share on other sites More sharing options...
Guest Wayne Posted April 14, 2013 Share Posted April 14, 2013 Wow' that's' very cool. Mesmerizing =-O Link to comment Share on other sites More sharing options...
dawson Posted April 14, 2013 Share Posted April 14, 2013 That is fab! Is it the effect the sound is having on the hose pipe or the water stream? Jd Link to comment Share on other sites More sharing options...
Guest Wayne Posted April 14, 2013 Share Posted April 14, 2013 Good question. I wondered that too. :-\ Link to comment Share on other sites More sharing options...
Guest Wayne Posted April 14, 2013 Share Posted April 14, 2013 It must be the hose? Link to comment Share on other sites More sharing options...
Tibbz2 Posted April 14, 2013 Share Posted April 14, 2013 That's spectacular, it almost looks fake! Link to comment Share on other sites More sharing options...
T A WOW Posted April 14, 2013 Share Posted April 14, 2013 Crazy! Link to comment Share on other sites More sharing options...
Guest Wayne Posted April 14, 2013 Share Posted April 14, 2013 I'd like to try it myself. But my speakers are too big to get up that high. Link to comment Share on other sites More sharing options...
dawson Posted April 14, 2013 Share Posted April 14, 2013 What about your hose pipe, would that reach Jd Link to comment Share on other sites More sharing options...
Guest Wayne Posted April 14, 2013 Share Posted April 14, 2013 (edited) No problem with that James. ;-) Edited April 14, 2013 by Wayne Link to comment Share on other sites More sharing options...
dawson Posted April 14, 2013 Share Posted April 14, 2013 Haha Link to comment Share on other sites More sharing options...
Guest Wayne Posted April 14, 2013 Share Posted April 14, 2013 I wonder if it can be done going to the toilet? Where,s my headphones? :-D Link to comment Share on other sites More sharing options...
dawson Posted April 14, 2013 Share Posted April 14, 2013 Microphone Link to comment Share on other sites More sharing options...
Guest Wayne Posted April 14, 2013 Share Posted April 14, 2013 Ho no.. Need new headphones lol :-D Link to comment Share on other sites More sharing options...
Orion Posted April 15, 2013 Share Posted April 15, 2013 Quite fascinating. So was the reverse one actually water going backwards? or was it just an illusion - water was going forward but the wave was going backwards - like when you see in films, car wheels sometimes appear to be going backwards when the car is going forwards. Physics man, I dunno what that is. Link to comment Share on other sites More sharing options...
Guest Wayne Posted April 15, 2013 Share Posted April 15, 2013 Quite fascinating. So was the reverse one actually water going backwards? or was it just an illusion - water was going forward but the wave was going backwards - like when you see in films, car wheels sometimes appear to be going backwards when the car is going forwards. Physics man, I dunno what that is. I know exactly what you mean :-P Link to comment Share on other sites More sharing options...
xanthic Posted April 16, 2013 Author Share Posted April 16, 2013 At the start, the frame rate of the camera is the same as the oscillation rate, so it appears fixed. If you tweak the oscillation back a little (to 23 Hz), it'll appear to go backwards, like the effect you see in films with car wheel rotating backwards. The wheel hasn't quite made a full rotation by the end of the frame, so it appears to step backwards. Link to comment Share on other sites More sharing options...
Guest Wayne Posted April 16, 2013 Share Posted April 16, 2013 Now I understand. Thanks Leigh :-) Link to comment Share on other sites More sharing options...
Sheila Posted April 16, 2013 Share Posted April 16, 2013 We did this when i went to Cambridge Uni a few weeks ago, the application of it was for inkjet printers I had to sing the note to get the water stream to 'freeze' as such. That stream froze as droplets in a straight line so i can only assume the hose introduces the wave effect. And yes we had it appearing to go backwards too. Sheila Link to comment Share on other sites More sharing options...
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