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Thread: why this is NOT a perpetuum mobile

  1. #1 why this is NOT a perpetuum mobile 
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    i was thinking on balance when i came with this design

    of course i know is not a perpetumm mobile but dont see why, why this shouldnt work since the water arm thought with the same weight than mercury so both remain in balance is always more to the right of the wheel

    in other words, in this wheel, cog will always be permanently to the right of the winge of the wheel with which a momentum appears, whats wrong with this?



    edit:

    dont get me wrong i dont want to build a perpetumm mobile but an stable inverted pendulum and this seems a very odd and intersting unbalance


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  3. #2  
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    What is a winge? Where is the cog? Your drawings are terrible.


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  4. #3  
    Administrator KALSTER's Avatar
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    Your drawings are terrible.
    Yeah, sorry man, but they are.
    Disclaimer: I do not declare myself to be an expert on ANY subject. If I state something as fact that is obviously wrong, please don't hesitate to correct me. I welcome such corrections in an attempt to be as truthful and accurate as possible.

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  5. #4  
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    sorry my bad hope this shows my doubt clearer:



    as you can see on the one hand both colums are in balance by aplying density*gravity*height of column

    but this moves the center of gravity off the center of the wheel with which theres an arm
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  6. #5  
    Forum Ph.D.
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    Loook here burtleburtle.net/bob/physics/whythere.html -

    there is no perpetual motion.
    get drawing lessons
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  7. #6  
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    i said first i dont intend this to be a pm

    i just wonder what happens here since:

    on the one hand both columns are in balance being mercuries 1 cm high and waters 13 cm

    on the other hand cog falls off the center with which theres an arm

    so if you say it doesnt move thanks a lot, thats exactly what i intend to have a stable cog NOT UNDER THE VERTICAL of the axle
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  8. #7  
    Forum Senior Booms's Avatar
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    Quote Originally Posted by Harold14370
    What is a winge? Where is the cog? Your drawings are terrible.
    hahah I love it! short and to the point

    I agree lux your drawings are truely awful, please don't become an artist, also whats a perpetumn mobile? and i'm also having rather alot of trouble understanding what you say in your first post



    Lux what I would take from this thread is that no one really knows, as shown very clearly by fizzlooney, when people in this forum can't answer something, they tend to throw up various facts about the subject while completely avoiding the question, instead of answering your question specific to your diagram, he's simply told you pmm's are impossible and hyperlinked you somewhere to prove it


    I havn't come across a mercury-water pmm before and frankly have no idea how it's supposed to work, however I can hazzard a few guesses as to why it doesn't work
    firstly it's possible that nature simply balances out the inbalance in the wheel that would give it perpetual motion, I don't know how it would, but I know nature does things like that sometimes so it's a possible cause

    secondly and far more likely, the wheel is not a pmm and instead simply transfers energy around the wheel, making it last for a much longer time that appears normal (much like a newtons cradle) without external factors like friction it would continue to spin indefinately but the initial energy is expended on these external forces over time
    It's not how many questions you ask, but the answers you get - Booms

    This is the Acadamy of Science! we don't need to 'prove' anything!
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