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Thread: center of mass

  1. #1 center of mass 
    Forum Freshman almirza's Avatar
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    hi

    can any one give me steps of finding the center of mass of an irrigular shape>
    If u have a bird > not real > but made of papaer or a stronf paper >
    How would u find its cenetr of mass??????


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  3. #2 Re: center of mass 
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    Locate its point of balance through trial and error?


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  4. #3  
    Forum Isotope (In)Sanity's Avatar
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    Hmm, that's what I would have said. I'll be curious if anyone has a brilliant way to do this.
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  5. #4  
    Forum Isotope Zelos's Avatar
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    u could use advnaced intergrale calculations, but what forumlas that is i dotn know
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  6. #5  
    Forum Isotope Zelos's Avatar
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    A<sup>b</sup>=d<sup>b</sup><sup>a</sup>A<sub>a</sub>
    just wanted to write it somewhere
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  7. #6  
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    Hang the bird from a string, and put a pin (or chopstick, or whatever) up the bottom of it aiming back up the string. Do this from a number of different points of attachment and where the pins intersect (or point to) is the center of mass.
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  8. #7  
    Forum Professor Zwolver's Avatar
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    hmm.. the bird has set up it's own gravity point.

    it's (when the bird's standing) in the middle of it's paws/claws.

    when the bird's flying it's between the tips of it's wings to the point the wings are attached to it's body. So a little under the wing muscles.

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  9. #8 Re: center of mass 
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    Quote Originally Posted by almirza
    hi

    can any one give me steps of finding the center of mass of an irrigular shape>
    If u have a bird > not real > but made of papaer or a stronf paper >
    How would u find its cenetr of mass??????
    how to find the center of mass of an irregularly shaped piece of CardBoard(eg a birdlike piece): make a hole A in it and hang it so it can "swing freely" on a nail clamped in a stand, it will come to rest with its center of mass vertically below A, to locate the vertical line through A tie a plumb line(a thread and a weight) to the nail and mark the vertical line on it, next hang the piece(lamina) from another position B, and mark the plumb line position,....., the center of mass lies at the "point of intersection" of the two lines.
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  10. #9  
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    We concur with the string theory - but only where the mass is rigid. If you're drilling a bird that's limp - no let's not go there....
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  11. #10  
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    Divide the object in as many possible symmetric objects and find their separate centre of masses and then cosidering each of them to be a point object placed at their respective centre of masses find out their collective CM.This will give you an approx. result.
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  12. #11  
    Forum Isotope Zelos's Avatar
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    thats basacly intergral
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  13. #12  
    Forum Professor captaincaveman's Avatar
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    Quote Originally Posted by billco
    We concur with the string theory - but only where the mass is rigid. If you're drilling a bird that's limp - no let's not go there....

    using string theory now, thats taking it too deep
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  14. #13  
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    Quote Originally Posted by captaincaveman
    Quote Originally Posted by billco
    We concur with the string theory - but only where the mass is rigid. If you're drilling a bird that's limp - no let's not go there....

    using string theory now, thats taking it too deep
    Yeah I realised as soon as I wrote it - but thought what the heck,
    But then isn't string theory itself 'hanging by a thread?
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