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Waves


xanthic
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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. :screwloose:


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Guest Wayne
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. :screwloose:
I know exactly what you mean :-P
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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.


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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 :facepalm: 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


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