Question

Topic Force and Pressure

A dam has a broader wall at the bottom than at the top. Give reason.

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Answer 1

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Force and Pressure ?

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The force acting on per unit area of a surface is called pressure. We can say force per unit area is called pressure. From above formula, we can say that with same applied force, Pressure is indirectly proportional to the area, thus pressure decreases with increase in area and increases with decrease in area.

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Answer 2

The deeper the water, the higer the pressure. Hence, the walls of dam are broad at the bottom so that the walls must not burst.

More the area, less the pressure. So, to reduce the pressure on the ground, the walls are made thicker than bottom.

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