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Play Atwood Machine...

Started by iacob alex, March 15, 2011, 05:46:53 PM

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iacob alex

#5
November 24, 2014, 09:46:48 AM
Quote from: iacob alex on November 24, 2014, 05:08:15 AM
......as : http://spiff.rit.edu/classes/phys369/workshops/w4r/atwood_diagram.gif
   ...but replace the gravity unbalance due to mass difference , with the reaction difference of a simply supported beam , due to a moving support , at :
             www.geocities.ws/iacob_alex/Some_Drafts/text032.jpg
If we substitute the pulley with a Class 1 lever (a "pedalling" crank...) and play continuous torque unbalance on the same side of the fulcrum...we have a simplified gravity "wavering" test of beams.


       Al_ex

MarkE

#6
November 24, 2014, 11:10:06 AM
Gravity acts on each of the two masses.  For one part of a cycle you extract energy by reducing the GPE of the system.  In order to complete the cycle you have to get the masses back into their original configuration.  At anytime do you believe that the way that gravity acts on either mass changed?  If you don't then no scheme based on moving those masses around can work.  If you do, then what makes you think that gravity changes in the way that it acts on one or both of the masses, and that it does so in an energy favorable way?
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