The straps of a school bag are made broad to increase..
volume
force
pressure
surface area
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The straps of school bag are broader: Since larger surface area exerts less pressure, therefore school bags with broader straps exert less pressure over the shoulder of a student while being slung over the shoulder and a student feels it easy to carry even a heavy bag with more books.
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Answer:
increase in surface area so that pressure on our shoulders be less
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