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## Gravity powered devices => Gravity powered devices => Topic started by: iacob alex on March 15, 2011, 10:46:53 PM

Title: Play Atwood Machine...
Post by: iacob alex on March 15, 2011, 10:46:53 PM

....with a heavy pulley (see this old topic),as a basic starting design and imagine a transposition,with a different "key"  (lever),as in a musical text ,if you intend to perform a self-repetitive motion due to the interplay between gravity and inertia ( torque difference on the same side of the fulcrum).

Heavy pulley becomes simply,a centered mass  (see the old "Heavy hub pendulum " topic)...an in-ex energy storage flywheel.

The string becomes a single length variable arm of the lever...the other is constant.

Regarding the additional small mass (Atwood Machine has equal arms)...this is missing ("redundant"),because the intended unbalance due to mass difference,is becoming an unbalance due to an arm difference/oscillation,with constant masses.

All the best! / Alex
Title: Re: Play Atwood Machine...
Post by: iacob alex on March 16, 2011, 05:45:00 PM

.....with a massive pulley at:   www.msu.edu/user/brechtjo/physics/atwood/atwood.html

The new idea,of a massive pulley  and  the next one (replace the string with a lever )can help us to think about a possible gravity motor?!

All the best! / Alex
Title: Re: Play Atwood Machine...
Post by: rupak447 on March 17, 2011, 04:39:32 PM
.....with a massive pulley at:   www.msu.edu/user/brechtjo/physics/atwood/atwood.html

The new idea,of a massive pulley  and  the next one (replace the string with a lever )can help us to think about a possible gravity motor?!

All the best! / Alex

Hm, it seems like an idea having the proof.
Title: Re: Play Atwood Machine...
Post by: iacob alex on March 22, 2011, 09:52:49 PM

.....with a pulley (two equal arms,two unequal masses),then,play the differential pulley (two unequal arms,two equal masses).

It can help you to imagine a final move,to a possible gravity motor,if you realize a self-leverage ,due to gravity-inertia interplay...

All the best! / Alex
Title: Re: Play Atwood Machine...
Post by: iacob alex on November 24, 2014, 11:08:15 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

Al_ex
Title: Re: Play Atwood Machine...
Post by: iacob alex on November 24, 2014, 03:46:48 PM
......as : http://spiff.rit.edu/classes/phys369/workshops/w4r/atwood_diagram.gif (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 (http://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
Title: Re: Play Atwood Machine...
Post by: MarkE on November 24, 2014, 05:10:06 PM
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?