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Pascal & Bernoulli Page 90
Pascal Movement of sea star is caused by pressure changes in fluid tubes within its body 90
Transmitting Pressure 1600’s French Scientist Blaise Pascal studied fluid pressure What happens when you press on a closed bottle? 91
Pascal’s Principle When a force is applied to a confined liquid, the change in pressure transmitted equally to all parts of the fluid 91
Hydraulic Systems Closed fluid system to take advantage of Pascal’s principle 92
Hydraulic Systems How does the force applied match the force transmitted? Same 92
Hydraulic Systems System B (larger side in 20 X) 20 X more force 92
Hydraulic Systems How? Uses fluid to transmit pressure equally 92
Hydraulic Systems Car Breaks 94
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 m 2 F = 2 Pa x 10 m 2 F = 20 N
Bernoulli’s Principle 1700’s Swiss Scientist Daniel Bernoulli Principle = As the speed of a moving fluid increases, the pressure within the fluid decreases 96
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 95
Ca ns 96
Applying Bernoulli Objects are designed so that the change shape causes a change speed of air  97
Applying Bernoulli If air moves faster above, how does the object move? 97
Applying Bernoulli If air moves faster below, how does the object move? 97
Applying Bernoulli Draw the air flow of a wing. Air moving over the top exerts less … 97
Applying Bernoulli Lift is another term for  upward force 97
Chimneys 98
Atomizers 98
Flying Discs 99
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?

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Pascal & Bernoulli