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Thread: Need an experiment for Young modulus.

  1. #1 Need an experiment for Young modulus. 
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    Hi to all,
    I need a high school experiment to determine the young modulus of a wire. As stated in my syllabus 'describe an experiment to determine the young modulus of a metal in the form of a wire'
    thanks in advance.


    I lost my fear toward the kiss, i do my best.
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  3. #2  
    Time Lord
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    I had to look up the term. I'm amazed they teach you about this in Highschool.

    http://en.wikipedia.org/wiki/Young%2...us#Calculation

    Apparently the calculation is:



    If I understand this right then it is simply how far the wire stretches when you pull on it. So I would think you could just measure the wire's length when it is not attached to anything, then hang the wire off of a table or something and attach a weight to one end and measure it again.

    I'm not entirely sure if that's correct, though. It looks like what it means, but I might be missing something.


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  4. #3  
    . DrRocket's Avatar
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    Quote Originally Posted by kojax
    I had to look up the term. I'm amazed they teach you about this in Highschool.

    http://en.wikipedia.org/wiki/Young%2...us#Calculation

    Apparently the calculation is:



    If I understand this right then it is simply how far the wire stretches when you pull on it. So I would think you could just measure the wire's length when it is not attached to anything, then hang the wire off of a table or something and attach a weight to one end and measure it again.

    I'm not entirely sure if that's correct, though. It looks like what it means, but I might be missing something.
    That is pretty much it.
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  5. #4  
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    Your biggest problem will be getting a measurable amount of stretch in the wire. The smaller the diameter and the longer the wire, the more elongation you will get with a reasonable amount of force. You will need a micrometer to measure the diameter of the wire.
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  6. #5  
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    And if you measure the diameter in both the stressed and unstressed condition you can determine the Poisson ratio as well as the Young's modulus.
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  7. #6  
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    Thanx. But is there someone who has a great deal of knowledge about it.
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  8. #7  
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    your homework was just done for you and you're unsatisfied? The indignance...
    Wise men speak because they have something to say; Fools, because they have to say something.
    -Plato

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  9. #8  
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    Quote Originally Posted by Adityasb
    Thanx. But is there someone who has a great deal of knowledge about it.
    try Timoshenko. The subject is called continum mechanics.
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  10. #9  
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    Anyway thankyou all for your replies. I got what i needed from this site- http://www.cyberphysics.co.uk/topics...ng_modulus.htm
    I lost my fear toward the kiss, i do my best.
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  11. #10  
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    It occurs to me that one should be able to measure Young's Modulus by recording the pitch change of a string instrument as various lengths of the string are wound around the tuning peg.

    But I find myself quickly confused. Anybody steer me into clarity and information?
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