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Thread: The weight of a tensioned rod

  1. #1 The weight of a tensioned rod 
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    My theory is that a tensioned rod should weigh less than an untensioned rod. This can be proved from very precise weighing. Also the weight loss can be calculated to be the cube of the change in length and the square root.


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  3. #2 Re: The weight of a tensioned rod 
    Universal Mind John Galt's Avatar
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    Quote Originally Posted by Joshua Stone
    My theory is that a tensioned rod should weigh less than an untensioned rod. This can be proved from very precise weighing.
    Has anyone ever carried out such an experiment?

    Quote Originally Posted by Joshua Stone
    Also the weight loss can be calculated to be the cube of the change in length and the square root.
    The square root of what?


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  4. #3  
    Forum Bachelors Degree x(x-y)'s Avatar
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    Surely, the weight (W=mg) should stay the same as you are not adding any more material (mass) to the rod and the gravitational field strength certainly won't change from 9.81N/Kg.

    If you don't add any more mass, then how can the weight change apart from introducing to a lower/higher gravitational environment?
    "Nature doesn't care what we call it, she just does it anyway" - R. Feynman
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