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Young's Modulus homework

  1. Oct 1, 2008 #1


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    1. The problem statement, all variables and given/known data

    I had to do an experiment and create a graph with the data.
    We attached one end of the Iron wire to a clamp and then tied on weights of 100g at a time to the other end so that a force can be applied to the Iron wire and so it stretches. (as pizza1512 did but in copper)

    2. Relevant equations

    Diameter of wire: 0.31mm (therefore area is 0.302mm²)
    Length of wire: 2m70cm (270cm)

    3. The attempt at a solution

    i worked out that if u apply 100g (1newton force)
    1/2700= 3.7x10^-4 (not sure if right)

    And stress is
    1/0.302= 3.3

    I worked out the Youngs Modulus
    3.3/(3.7x10^-4) and i got 8918.92

    is that right?
    and how do i plot it on a graph
  2. jcsd
  3. Oct 1, 2008 #2


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    How did you work that out? From what? What are the units of that expression?
  4. Oct 1, 2008 #3


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    It is for Strain.
    it extended by 1mm
    1mm/2700mm (length of wire) =3.7^-4
  5. Oct 1, 2008 #4


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    [tex]E = \frac{\sigma}{\epsilon} = \frac{F*L}{A_o*\Delta L} = \frac{1N * 2.7m}{.302*10^{-6}m^2*.001m}[/tex]

    Straighten out your units.

    All you have provided is one data point so I'm not sure what kind of graph you're talking about.
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