Write an activity to show that synthetic fibres are stronger than the cotton fibres

cbse
cbse-class-8-science
synthetic-fibres
and-plastic

#1

Write an activity to show that synthetic fibres are stronger than the cotton fibres.

Answer:
Activity:
image

  • 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.