why is it difficult to hold a school bag having a strap made of a thin and strong string??
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Why is it difficult to hold a school bag having a strap made of a thin and strong string? It is difficult to hold a school bag having a thin strap because the pressure on the shoulders is quite large. This is because the pressure is inversely proportional to the surface area on which the force acts.
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It is difficult to hold a school bag having a strap made of thin and strong string because we know that pressure is greater when there is a small area of contact and in this case the area of contact is very small because strap is thin therefore, it is difficult hold such a school bag because our shoulder will feel very heavy. So to ease this we use thick and broad straps made of thick cloth called canvas
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