This is my method for finding youngs modulus of copper wire. I have tryed to make it as accurate and fair as possible. This is just the test, not the analysis of the data. Please be critical. -Measure Out 1m of wire -close a vernier scale and measure when completly shut to calculate the systematic error. - Calculate the area by taking measurements of the wire with a venier scale every 10cm (calculate the average) -Set up apparatus -weigh weights to make sure they are what they say they are. E.G a 200g weight really weighs 200g. -Apply a 300g test weight to straighten out the wire, leave for 2 minutes for the weights to have effect - Mark out a section of wire -measure the distance between the fixed end of the wire and the marker -Apply weights in 200g intervals till reaching 1000g above test weight. Leave for 2 minutes for weight to have effect. Then see how much the marker has moved using a ruler. The extention is the difference between that reading and the one between the fixed end of the wire and the marker we did earlier on. [ P.S can anyone tell me how to calulate uncertainys, I see in testresualts of a percentage of uncertianty] P.S.S sorry about spelling im dyslexic.