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Calculating Force Using Young's Modulus

  1. Jan 28, 2010 #1
    1. How to calculate cross sectional area and force for Young's Modulus? My main issue is that I don't know my F or my Ao. Help?
    e=Constant 2.106
    DeltaL=10mm
    Lo (original length of elastic)= 200mm
    f=?
    Ao=?


    2. E= FLo
    Ao(Delta)L
    F= EAoDeltaLength[U/]
    Lo
    F= (2.106)(10mm)(Ao)
    200mm


    3. There are two unknown variables!! How can I do this?
     
  2. jcsd
  3. Jan 28, 2010 #2

    radou

    User Avatar
    Homework Helper

    Interesting. From the given change in length and original length, you can calculate the strain. Then you can multiply with E to obtain the stress. But you can't calculate the area if the force is unknown, and vice versa.
     
  4. Jan 28, 2010 #3
    Right.
    What is the force though? How can force be calculated?
    How is cross-sectional area calculated?
     
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