Write an activity to show that synthetic fibres are stronger than the Cotton fibres ?
Answers
Synthetic fibres are stronger because they are made by plastics and other materials.Nylon is an example of synthetic fibre which is used for making parachutes and ropes for rock climbing.Activity -
Activity -Take threads of cotton and nylon (synthetic fibres) of about 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. 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.
CONCLUSION
Much more weight is required to break the nylon thread showing that nylon thread has a grater strength that the cotton thread.
Take an iron stand with a clamp and a cotton thread of about 65 cm length.
Tie the thread to the clamp so that it hangs freely as shown in figure.
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 fibre.
Repeat the same activity with threads of wool, silk and nylon.
You will observe that the weight required to break the threads of wool, silk and^nylon is more than cotton. So, synthetic fibres are stronger than cotton.