# Selina Solutions Class 9 Physics Solutions for Exercise 4A in Chapter 4 - Chapter 4 Pressure In Fluids And Atmospheric Pressure

Question 21 Exercise 4A

A dam has broader walls at the bottom than at the top. Explain.

The pressure exerted by a liquid is dependent on the depth in a way that it increases with greater pressure. That is to say, as the depth increases, the pressure applied by water on the walls of the dam also increases. In order to withstand the great pressure, the walls are built thicker. Hence a dam has broader walls at the bottom than at the top.

Video transcript
hello everyone welcome to leader learning i am good preet your science tutor today's question is a dam has broader walls at the bottom than at the top explain you have to explain this statement so we know that pressure exerted by a liquid is dependent on depth okay that is if there is greater depth the pressure will also be greater so in case of dam as the depth increases the pressure applied also increases increases where it is increases on the walls of dam [Music] so in order to with a stand in order to withstand the pressure the walls are built broader hence the dam has a broader walls at the bottom then at the top so this is your explanation for more such videos please subscribe leader learning and for any doubts drop a comment thank you
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