Why is it difficult to hold a school bag having a strap made of a thin and strong string?

Answer

We know that

Pressure = Force/Area

 

In case of a thin strap of bag,

the area of the strap is less.

Hence, the pressure exerted on the shoulders is more.

 

In case of a thick strap of bag,

the area of the strap is more.

Hence, the pressure exerted on the shoulders is less.

 

That is why in case of a thin strap, the pressure exerted on the shoulders is more and hence it is difficult to hold such a bag.

  1. Class 9
  2. Chapter 10 Class 9 - Gravitation

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.