Im about to hand coursework in. Its the youngs modulus of copper wire(adsbygoogle = window.adsbygoogle || []).push({});

We added 100g weights and measured the extension using a traveling microscope.

for example at 0.900kg the wire extended by 6.36cm

my calculations are

Diameter = d 2.7x10-5 m

Cross section area A = Pi x d (squared) /4 = 5.7 x 10-8

Applied Force F = (mxg) 0.900 x 9.81 = 8.82 kg m s-1

Extension e = 0.0636 m

Original length L = 1.788 m

So Stress = F/A = 1.54 x 10(8)

Strain = E/L = 3.6 x 10-2

Stress / Strain = Youngs modulus E = 42 x 10(8) Pa

Does this look correct?

If i was to work out my mass / extension from my graph i would get this ...

m/e = 14.2 x (gxL) 17.5 / A 5.73 x 10-8 = 4.3 x 10(9) pa

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# My calculations - youngs modulus

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