Question

why is it difficult to hold a School Bag having a strap made within thin and strong string

Answer 1

pressure is inversely proposnal to area so when the area of school bag strap increase then it will comfortable for us

Answer 2

It is difficult to hold a school bag having a strap made with thin and strong string....
This is because the area becomes less so pressure applied is more....
As area and pressure are inversely propotional...
Thus it can cause harm to us with more pressuse of heavy bag....