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A Comparison of the Strengths of Natural and Synthetic Fibres Hypothesis: I believe that synthetic fibres will be stronger than natural fibres. Plan: To investigate the strengths of synthetic and natural fibres we have used a clamp stand, 100g and 50g weights and a variety of different threads. All of the threads we used were the same colour (black) except nylon, which cannot be dyed. The threads we used were: viscose (synthetic) cotton (natural), quilting cotton (natural), silk (natural), nylon (synthetic), two types of polyester (synthetic), wool (natural) and polyester 40%/polyamide 60% (synthetic). The fibres were shared out for testing and then the results were pooled. I tested the first five fibres We measure the threads (15cm) and tied them to the clamp stand, tying each thread in three knots, and then attached the weights, again using three knots. We then carefully added the weights to see when the threads snapped. We tested each thread...

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