give reason - a) shoulder bag …

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Meghna Thapar 5 years, 10 months ago
a. A school bag has wide strap made of thick cloth so that the weight of the bag may fall over a large area of shoulder of the child producing less pressure on the shoulder due to which it is more comfortable to carry the heavy school bag.
b. The tip of a nail is sharp so that it may put the force on a very small area of wood, producing large pressure sufficient to go into the wood when it is hammered.
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