Mention any two examples that obeys Bernoulli's theorem theorem and justify them?
Answers
Applications of Bernoulli's theorem :-
1. Dynamic lift on the wings of an aeroplane is due to Bernoulli's theorem.
2. Swinging of a spring cricket ball is a consequence of Bernoulli's theorem.
3. During cyclones, the roof of thatched houses will fly away. This is a consequence of Bernoulli's theorem.
According to Bernoulli's theorem, pressure is more at a point where the velocity of a fluid is less and vice versa.
Example 1 :- (Magnus effect) :- When the ball is spinning and moving in air, it's rough surface drags some air around it then resultant velocity on the top surface of the ball increases and pressure decreases (falls). Similarly the resultant velocity of the bottom surface of the ball decreases and pressure increases this creates pressure difference due to this, ball experiences dynamic lift upwards.
Example 2 :- Dynamic lift on an air craft wing :- When air craft is moving on the runway, the wind flows with high speed on the top of the wings than at the bottom. This creates less pressure at the top and maximum pressure at the bottom of the wing. Due to this pressure difference the aircraft experiences dynamic lift upwards.
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