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Bernoulli s Principle
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Transcript of Bernoulli s Principle
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S C I E N C E F O R M 5
THE MOTION OF
VEHICLES IN THE AIR
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PRINSIP GERAKAN
Hot air balloon
- Hot air ballon will rise upward if its total weight is lessthat the weight of air it displaces
- Upward motion of hot air balloon is based on theprinciple of Archimedes
- a) air in the hot balloon is heated
- b) the air expand, so large volume of air is pushed
out through the hole at the bottom- c) the gas in the balloon are less dense than
surrounding.
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PRINSIP OPERASI ENJIN JET DAN ROKET
-Enjin roket membawa bahan api hidrogen
dan oksigen dalam bentuk cecair
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PRINSIP OPERASI ENJIN JET DAN ROKET
-The combustion of mixture of fuel and
oxygen produces a large forces
-Quantiti gas panas yang dipaksa keluar mllekzos dengan kelajuan yg sangat tinggi
menghasilkan momentum yg sgt besar
-Momentum gerakan gas akan menghasilkan
satu tujah yang kuat dan menolak roket ke
atas
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ENJIN JET
-Pembakaran dalam yang berkuasa
tinggi
-Membawa bahan api kerosin
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PRINSIP OPERASI ENJIN JET DAN ROKET
-Apb enjin dihidupkan, udara disedut masuk
oleh kipas turbo melalui pemampat
-Udara dimampat sehingga suhunya tinggidan dimasukkan ke ruang pembakaran
-Gas panas yang terhasil mengembang dan
dipaksa keluar dr enjin melalui ekzos
-Ini menghasilkan momentum yg sgt besar
-Momentum gerakan gas akan menghasilkan
satu tujah yang kuat dan menolak jet ke
depan
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Bernoullis Principle
The Swiss mathematician and physicistdiscovered the Bernoulli's principle.
He found the concept of Bernoullis
principle when doing the experiment ofwater flow through the container.
Daniel Bernoulli(1700-1782)
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Bernoullis Principle
a) As fluid moves from a widerpipe to a narrower one, thespeed of water flow will beincrease.
b) As the speed of water flow
increase, the pressure willdecrease and the watercannot go up the upside ofpipe easily.
Hence Bernoulli's conclusion: the
slower the rate of flow, the higherthe pressure, and the faster therate of flow, the lower thepressure.
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BERNOULLIS PRINCIPLE
states that
The pressure is inversely proportional to the
speed of a moving fluid.
a) If the speed is high, the pressure is low.
b) If the speed is low, the pressure is high
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The Effects of Bernoullis Principle
Lets do an activity together !
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Aerofoil
Uplift force
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Application of Bernoullis Principle In Life
When an aeroplanemoves forward, air movesfaster at the top of theaerofoil than below it.
The higher pressure at the bottom of the aerofoil will push it up toproduce an uplift force.
To fly, the upthrust must be greater than the weight of the
aeroplane.
This creates a lowpressure condition on thetop of the aerofoil.