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# Testing Materials Coursework

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Introduction

Testing Materials Coursework Tommy Patton Plan In this investigation we are going to measure the tensile strength of four different materials, these are: * Elastic * Wool * String * Plastic fishing wire We will measure the tensile strength in grams and kilograms. To make sure that the comparisons we make are fair we are going to repeat the investigation 3 times for each sample of material, use the same apparatus throughout the investigation, use the same weights for each sample and use the same length of material for each sample. ...read more.

Middle

when the sample material snaps the weights won't fall on the bench, we will also keep well away from the weights so that they won't fall on our feet. Results The table below shows our results. Sample Material Broke Didn't Break Weight Needed (Kg) Wool test 1 x 2.5 test 2 x 2.35 test 3 x 2.5 String test 1 x 3+ test 2 x 3+ test 3 x 3+ Elastic test 1 x 1.5 test 2 x 1.65 test 3 x 0.7 Plastic Wire test 1 x 3+ test 2 x 3+ test 3 x 3+ I believe that test 3 for the elastic sample is an outlier and should be disregarded. ...read more.

Conclusion

Evaluation Getting the same length of material for every sample, putting all the weights on equally, getting enough material for samples and putting the weights on in the same order were some of the difficulties we had with collecting reliable data for the investigation. I am quite confident in my conclusions but I believe that they could have been improved. The investigation could have been improved by, measuring each sample of material previous to the investigation, using weights that were all the same size and shape and having more weights to make sure that all the materials snapped. If these were all taken into account our results would have been more accurate and it would have been easier to collect reliable data. Tommy Patton 10R ...read more.

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