Activity 3.1 Class 8 Science Chapter 3 Synthetic Fibres and Plastics

 Activity 3.1 Class 8 Science Chapter 3

 

In this post, you will find NCERT Science Class 8 Chapter 3 Synthetic Fibres and Plastics Activity solutions.  Class 8 science chapter 3 consists of NCERT Activity 3.1 Class 8 Science Explanation with a conclusion.

 
NCERT Activity 3.1 Class 8 Science Explanation with a conclusion

You are suggested to study NCERT activity 3.1 class 8 science explanation with a conclusion so that you can attempt questions based on activity 3.1 class 8 science.

Activity 3.1 Class 8 Science

    ·     Take an iron stand with a clamp.

    ·     Take a cotton thread of about 60 cm in length.

    ·     Tie it to the clamp so that it hangs freely from it.

   ·     At the free end suspend a pan s 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 eth strength of the fibre.

    ·     Repeat the same activity with threads of wool, polester, silk and nylon.

    ·     Tabulate the data in the following table.

    ·     Arrange the thread in order of their increasing strength.

·      

S.No.	Type of thread/fibre	Total weight required to break the thread
1	Cotton
2	Wool
3	Silk
4	Nylon

 

Note: All threads should be of the same length and thickness.

 

 Activity 3.1 Class 8 Science Synthetic Fibres and Plastics

Observation of activity 3.1 Class 8 Science

We observe, more weight is required to break the nylon thread in comparison to other threads.

Note: length of all threads has been taken to 30 cm.

S.No.	Type of thread/fibre	Total weight required to break the thread
1	Cotton	¼ kg
2	Wool	½ kg
3	Silk	¾ kg
4	Nylon	1 kg

 

 

Explanation of activity 3.1 Class 8 Science

 

The strength of the fibres depends upon their constituent molecule(polymer). The tensile strength depends upon the thickness and length of the fibre.

The order of tensile strength is as follows

 

Cotton <Wool < Silk< Nylon

 

So, cotton holds the lowest weight and nylon holds the heavier weight than others.

Conclusion of activity 3.1 Class 8 Science

We can conclude that nylon is the strongest of all other threads.

  Related Topics

1. Activity 3.2 Class 8