Question

In which case out of the following is it easier to lift the school bag full of books. Explain:
a) school bag with thin and strong string.
b) school bag with a strip of wide cloth band

Answer 1

Answer:

(b) school bag with a strip of wide cloth band.

Explanation:

because then pressure exerted on our shoulder would be less as compared to when we carry bag with thin and strong string.

As pressure=thrust/area.

thus, as area of cloth band would be large than that of thin string, pressure exerted would be comparitively less.

Answer 2

Answer: School bag with wide cloth band will be easier to lift.

Explanation: Since pressure depends on force and area . If force is equal and area is different than object which has larger area will exert less pressure . In object which we carry they have border area to exert low pressure so they are easy to carry