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TESTING THREADS 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. We then carefully added the weights to see when the threads snapped. We tested each thread seven times to make the test fairer. Results: Thread 1 2 3 4 5 6 7 Mean Cotton 1600 1800 1800 1800 1100 1700 1700 1733.3 Silk 1600 1700 1300 1400 1300 1400 1500 1457.1 Rayon 350 250 550 450 350 450 450 407.1 Weigh needed to break (g) Analysis: For the cotton results I took the 5th result out, because it is the odd one out. To make the test fair, we worked out the mean for each thread by adding all the results and dividing it...

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