Pascal & Bernoulli
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Transcript of Pascal & Bernoulli
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Pascal & Bernoulli
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Pascal
Movement of sea star is caused by pressure changes in fluid tubes within its body
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Transmitting Pressure
1600’s French Scientist Blaise Pascal studied fluid pressure
What happens when you press on a closed bottle?
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Pascal’s Principle
When a force is applied to a confined liquid, the change in pressure transmitted equally to all parts of the fluid
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Hydraulic Systems
Closed fluid system to take advantage of Pascal’s principle
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Hydraulic Systems
How does the force applied match the force transmitted?
Same
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Hydraulic Systems
System B (larger side in 20 X)
20 X more force
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Hydraulic Systems
How?
Uses fluid to transmit pressure equally
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Hydraulic Systems
Car Breaks
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Review
What is Pascal’s principle?
What is the device that uses this system?
Hydraulic System
What is the force? F = Pressure x Area
If pressure is 2 Pa and area is 10 m2
F = 2 Pa x 10 m2
F = 20 N
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Bernoulli’s Principle
1700’s Swiss Scientist Daniel Bernoulli
Principle = As the speed of a moving fluid increases, the pressure within the fluid decreases
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Paper
Take a sheet of paper and hold the corners.
Blow across the top of the paper
What happens?
Why?
Air pressure below is
higher so it pushes the
paper up
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Ca ns
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Applying Bernoulli
Objects are designed so that the change shape causes a change speed of air
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Applying Bernoulli
If air moves faster above, how does the object move?
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Applying Bernoulli
If air moves faster below, how does the object move?
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Applying Bernoulli
Draw the air flow of a wing.
Air moving over the top exerts less …
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Applying Bernoulli
Lift is another term for upward force
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Chimneys
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Atomizers
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Flying Discs
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Bat Wings
Read story
1. What would a bat use to land? Why?
2. Which would the bat use to catch bugs? Why?
3. Average flying? Why?
4. What would happen if one wing a and the other c? Why?
5. Why never use d?