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Question
Write an activity to show that synthetic fibres are stronger than the cotton fibres.
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Solution
Activity: Take threads of cotton and nylon (synthetic fibres) of about the same length and thickness. Hang cotton, thread from a stand. Attach a pan at the other end of the thread.
Add weights, one by one, to the pan until the thread breaks (see figure) note the total weight required to break the cotton thread. This gives a measure of the tensile strength of the thread. Repeat the same with nylon thread.
Arrangement to determine the relatives strengths of natural fibres and synthetic fibres.
Conclusion
Much more weight is required to break the nylon thread showing that nylon thread has greater strength than the cotton thread.
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RELATED QUESTIONS
Fill in the blanks with appropriate words.
Synthetic fibres are also called ______ or _______ fibres.
Crossword
Across
1. Fibre that is used as synthetic wool.
2. A plastic used for making water bottles.
3. A long chain made of small repeatingmonomers.
4. Another name for this semi-synthetic fibre is artificial silk.
Down
5. A type of fibre that is naturally obtained from a cocoon.
6. A synthetic fibre classified as polyester.
7. A polymer used for making rope.
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Anory
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Synthetic fibres do not melt on heating
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