explain with the help of an activity that nylon thread is stronger than wool cotton and Silk
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The clothes which we wear are made of fabrics. Fabrics are made from fibres obtained from natural or artificial sources. Can you name some natural fibres? Fibres are also used for making a large variety of household articles. Make a list of some articles made from fibres. Try to separate them into those made from fibres and those made from artificial fibres. Make entries in Table 3.1.

Why did you label some fibres as artificial? You have read in your previous classes that natural fibres like cotton, wool, silk, etc., are obtained from plant or animals. The synthetic fibres, on the other hand, are made by human beings. That is why these are called synthetic or man-made fibres.

Why did you label some fibres as artificial? You have read in your previous classes that natural fibres like cotton, wool, silk, etc., are obtained from plant or animals. The synthetic fibres, on the other hand, are made by human beings. That is why these are called synthetic or man-made fibres.
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Take an iron stand with a clamp. Take a cotton thread of about 60 cm length.Tie it to the clamp so that it hangs freely from it as shown in Fig.3.4 At the free end,suspend a pan so that weight can be placed in it. Add weight one by one till the thread breaks. Note down the total weight required to break the thread This weight indicates the strength of the thread. Repeat the same activity with threads of wool and steel of similar length and thickness. You will observe that nylon thread is strongest among them.
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