A school bag has wide strap made of thick cloth so that- *
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A school bag has wide straps made of thick cloth so that the weight of bag may fall over a large area of the shoulder of the child producing less pressure on the shoulder. Due to less pressure, it would be more comfortable to carry the heavy school bag.
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it is thick at the strip because in thick area pressure is less where as if the strip will be thin the pressure will be more for more ans u can refer class 8 living science book of ratna Sagar ch - 11
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