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bernoulli's principle class 9

This post explained about bernoulli's principle class 9 how does bernoulli's principle work class 9 We observe a calendar on the wal...

This post explained about bernoulli's principle class 9


how does bernoulli's principle work class 9


We observe a calendar on the wall of a room fluttering when the ceiling fan in the room blows air. During cyclones when wind blows at high speeds, the thatched roofs are blown away.


Paper fluttering away from the table
Paper fluttering away from the table 
Thatched roof blowing away in cyclone
Thatched roof blowing away in cyclone 

An aeroplane is able to fly in air against its own weight. What phenomenon is responsible for these to happen? 


When air blows over the top surface of any body with high speed, a pressure difference between the top and the bottom surfaces of the body is created. A low pressure region is created above the top surface of the body. Hence, the pressure of air above the top surface of the body is less than the pressure of air at the bottom surface. The relation between the two was discovered and developed by a scientist named Bernoulli and the principle is known as Bernoulli's principle.




Explanation of bernoulli's Principle class 9


  1. When wind blows at a very high speed over the roof of a hut a low pressure region is created above the roof. This creates a pressure difference between the top and the bottom surfaces of the roof. The pressure difference causes an upthrust on the roof, and hence, it is blown away. 
  2. If the wind is blowing horizontally over a paper placed on a table, a low pressure created above the paper. The high pressure below the paper makes it fly away.
  3. The flying of aeroplanes in air against their own weight is based on Bernoulli's principle. The propeller present in front of an aeroplane helps in blowing the air backwards with high speed. The shape of the wings is such that the speed of air blown from the propeller creates a pressure difference between the top and the bottom surfaces of the wings. This is due to the speed of air above the wings being greater than that in the region below the wings. The difference of pressure (p) thus created is multiplied with the area of ​​wings (A), giving an upward thrust (T) to the aeroplane, i.e. , T = p × A. If the plane has wings of a very large area, an upward thrust greater than the weight of the aeroplane acts on the wings, lifting the plane into the air.




bernoulli's principle formula class 9

The formula for Bernoulli’s principle is given as:                    

12
p+
1
2
p
v2
+pgh

Where, 
  • h is the height of the container
  • p is the pressure exerted by the fluid
  • ρ is the density of the fluid
  • v is the velocity of the fluid

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conclusion 

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