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## Homework Statement

find the young modulus of copper through calculating the stress and strain, plotting on a graph and finding

the gradient of the linear part of the graph

## Homework Equations

ym=stress/strain

stress=force/ area

strain= extension/length

## The Attempt at a Solution

having spent several lessons streching a piece of wire i came to drawin my graphs.

However as the ruler has mm markings and the wire only stretched by a couple of mm's i have really really large error bars on my graph. (about 50% near the bottom).

These have streched the gradient so that it is nearly infinate. The maximum gradient is less than th average gradient and the minimum gradient is negative.

HELP!

the graph looks a bit like this:

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