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# Data Analysis: Materials

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Introduction

Aim of the Investigation The aim of the investigation was to investigate the tensile strength of different materials. I chose to use tights which had a different denier. Planning the investigation I will be using three different types of tights (10 denier, 15 denier, and 40 denier) and I will be measuring the tensile strength of each of them. To measure the strength of each sample of material, I will use weights to see how far the different samples will stretch, and then I will use a ruler to measure how long the material has become. To make this a fair test, and to make fair comparisons between different material samples, I will need to keep some things the same. These are: * The length used of tights * The starting weight * The total weight added * Use the same apparatus * Use the same colour, brand and size (e.g. ...read more.

Middle

It has four columns for each type of tights, this is because I did the experiment three times for each type of tights and then worked out the average. 10 Denier Tights Force/Load (N) Extension (mm) Average Extension Reliability 0 0 0 0 0 100% 1 80 50 70 66.6 62.50% 2 100 70 90 86.6 70% 3 120 90 100 103.3 75% 4 140 100 130 123.3 71.40% 5 150 120 140 136.6 85.70% 6 160 130 150 146.6 81.25% 15 Denier Tights Force/Load (N) Extension (mm) Average Extension Reliability 0 0 0 0 0 100% 1 40 40 40 40 100% 2 90 80 80 83.3 88.80% 3 150 120 120 130 66.70% 4 170 150 140 153.3 82.30% 5 190 170 160 173.3 84.20% 6 200 180 170 183.3 85% 40 Denier Tights Force/Load (N) Extension (mm) Average Extension Reliability 0 0 0 0 0 100% 1 40 40 50 43.3 80% 2 70 60 70 66.6 85.60% 3 90 90 90 90 100% 4 ...read more.

Conclusion

To improve this experiment, I could have used half Newton weights instead of whole Newton's as this would have made my results clearer as to how much the tights were stretching. Also, to improve I could have repeated the experiment more times so that I would have more reliable results. Theory My experiment did not match my prediction as I thought that the 40 denier tights would be the stretchiest and the 10 denier tights would stretch the least but it worked out that the 40 denier tights were the least stretchy and the 15 denier tights stretched the most. Conclusion Conclusively my results have shown me that the tights with the biggest tensile strength were the 15 denier tights, and the tights with the smallest tensile strength were the 40 denier tights. When I put all of my graphs into one, I could see at what different points, which different tights had stretched the most. ?? ?? ?? ?? Science Coursework Data Analysis ...read more.

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