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1. Why school bags have broad shoulder straps ?
lind force change the speed
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Answer:
Broad shoulder straps provide larger surface area. So, the pressure exerted by the bag on the shoulder is less and carrying the bad is easier.
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School bags have board shoulder straps to reduce the pressure applied on the shoulder,
pressure = thrust by unit area
increase in area , reduce in pressure because area is inversely proportional to pressure
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