Which of the following situations is not an application of pressure?

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A sharp iron nail is inserted into a wall easily.

An apple falls on the ground.

Straps of school bags are made wider.

Porters put a thick round piece of cloth on the head to carry heavy loads.

answer is C.

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Detailed Solution

Pressure is defined as the perpendicular force exerted per unit area. It is inversely proportional to the area.
Porters put a thick round piece of cloth on the head while carrying heavy loads to distribute the force on a larger area and reduce the pressure.
A sharp iron nail is inserted into a wall easily because the applied force is concentrated on a small tip which results in higher pressure.
Straps of school bags are made wider to distribute the force on a larger area and reduce the pressure.
Apple falls on the ground due to gravitational force.

Therefore, we can say that the falling of an apple on the ground is not an application of pressure.

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