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Question

When is the pressure on the ground more-when a man is walking or when a man is standing? Explain.


Solution

Pressure is defined as the normal force on a surface per unit area.

Pressure=ForceArea 

Pressure is inversely related to area. For a constant force if the area is less then the pressure will be high and if the area is more then the pressure will be less.

When the man is standing, his feet are in complete contact with the ground. Due to this, the contact area is more with the ground and it results in less pressure. On the other hand, when a man is walking, at any instant his feet will not be in complete contact with the ground. Due to this, the contact area is lesser and it results in the application of higher pressure on the ground.


Physics
Science for Ninth Class - Part I - Physics
Standard IX

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