Question

explain why school bags are provided with wide straps to carry them

Answer 1

As we know that pressure is inversely proportional to area, so an increase in area means decrease in pressure.
School bags are provided with broad straps to increase the surface area in contact with the shoulders and reduce pressure on the shoulders.
If thin straps would be used, then surface area in contact with the shoulders would decrease which will lead to increase in pressure on shoulders.

Answer 2

School bags are provided with large wide straps to carry them because it increases the surface area in contact with the shoulder and reduce the pressure of the shoulder of the students shoulder..