Question

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

Answer 1

We know,

$Pressure=\frac{Force}{Area}$

It is difficult to hold a school bag having a strap made of thin and strong sting$,$ because the thin string has a very little contacting area in case of a school bag having a strap made of thin and strong string which increases pressure which is uncomfortable to carry the school bag$.$