Physics
A dam has broader walls at the bottom than at the top. Give a reason.
Force
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Answer
The pressure at a point due to a liquid increases with the increase in height of the liquid column above it, so to withstand the increasing pressure of water a dam has broader walls at the bottom than at the top.
In the figure given below, the increasing length of arrows in water represents the increasing pressure on the wall of the dam towards the bottom.
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