Is it true that it is difficult to hold a school bag with a strap made of thin and strong string?

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True

False

answer is A.

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Detailed Solution

The given statement is true.

Pressure = \frac{Force}{Area}

Pressure is the force acting on a unit area of any surface. When the contact area decreases, the pressure increases and vice versa. Since Pressure is inversely proportional to the area, smaller the area of contact is, more will be the pressure. Hence broad area of contact will exert less pressure.
Since the area of the strap is thin, the area of contact is less which in turn will exert more pressure on the shoulders. Hence it is difficult to hold a school bag with a strap made of thin and strong string.

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