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Introduction

12/12/2007

Testing

Middle

Data Analysis

## TESTING COTTON, SILK AND RAYON THREADS

Plan:

To investigate the strengths of 3 different threads and which is the strongest we have, we used a clamp stand, 100g and 50g weights and 3 different types of threads. All of the threads we used were the same colour (black). The threads we used were: Rayon (synthetic) cotton (natural) and silk (natural).

We measure the threads (30cm) and tied them to the clamp stand, tying each thread in three knots, and then attached the weights, again using three knots.

Conclusion

There was not enough time to thoroughly investigate the strength of the thread. We were sometimes rushed and could have made mistakes because of our haste. We could also have tested the fibres more and tested a larger number of fibres if we had had more time to conduct the experiment.

We did not check that the weights were all the exact weight that they were marked as being. This means that some of the weights could have been lighter or heavier than perceived and outliers may be due to this.

The outlier could also be because of an actual difference in the strength of the fibre. The results for the first cotton, for example, are very varied but none of them are extremely far from the other results. This could be because the fibre’s strength varied or portions of the fibre could have been weaker.

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