Question

Take an iron stand with a clamp. Also, take a cotton thread of about 60cm length. Tie it to the clamp so that it hangs freely from it. At the free end suspend a pan so that weights can be placed in it. Add weights one by one till the threads breaks. Note down the total weight required to break the thread. This weight indicates the strength of the fibre. Repeat the activity with threads of wool, polyester, silk and nylon. Tabulate the data in tabular format and arrange the threads in order of their increasing strength.

a) How can you arrange the natural and synthetic fibres in the order of their increasing strength?

b) Describe the activity in details to compare the strength of synthetic fibres with those of natural fibres and also give diagram in support of your answer.​

Answer 1

Answer:

Take a cotton thread of about 60 cm length. Tie it to the clamp so that it hangs freely from it as at the free end, suspend a pen so that weight can be placed in it. ... Repeat the same activity with threads of wool and steel of similar length and thickness. You will observe that nylon thread is strongest

Answer 2

Answer:

Tensile strength of polymer increases with an increase in chain length and crosslinking of polymer chains.

According to this, the tensile strength of wool < silk < cotton < nylon < polyester.

Artificial fibers like nylon and polyester are designed specially to have more tensile strength. Hope it will help you ❤️