school bags have board
straps
Answers
Answered by
5
That's because by increasing the surface area the pressure is decreased thus they have broad straps.
Answered by
5
Because it is easy to carry. A wider strap distributes the force throughout a greater surface area. You can do a comparison using a simple physics equation. So take two different straps and measure the area of them///this is your answer i think it may help you
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