... = force in Newton's, k = spring constant and x = extension in metres. I also believe that the amount that my metre rule will bend shall be quantitative. By this I mean that if the load doubles, so will the extension. I believe that if I put on three times the load, I will get three times the extension (and so on until eventually the metre rule cannot hold any more weights and snaps.) This shows that the extension is directly proportional to the stretching force. Therefore I will choose the following loads: 100g, 200g, 300g, 400g, 500g, 600g, 700g, 800g, 900g, and 1000g. This will make it easy for me to tell whether my results will be quantitative and it is unlikely that the metre rule will snap with only 1000g as the maximum load. If the rule did snap, we could say that it had gone passed ...

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