Pressure and Pascal’s Principle. PRESSURE! FORCE.

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Pressure and Pascal’s Principle

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Transcript of Pressure and Pascal’s Principle. PRESSURE! FORCE.

Page 1: Pressure and Pascal’s Principle. PRESSURE! FORCE.

Pressure and Pascal’s Principle

Page 2: Pressure and Pascal’s Principle. PRESSURE! FORCE.

PRESSURE!

Page 3: Pressure and Pascal’s Principle. PRESSURE! FORCE.

FORCE

Page 4: Pressure and Pascal’s Principle. PRESSURE! FORCE.
Page 5: Pressure and Pascal’s Principle. PRESSURE! FORCE.

Pressure – force per unit area

FP

A

2Units:

NPa

m

Page 6: Pressure and Pascal’s Principle. PRESSURE! FORCE.
Page 7: Pressure and Pascal’s Principle. PRESSURE! FORCE.

Quick lab.Find the pressure each of your feet

exerts on the floor.

How would the pressure change if you stood on one foot?

How would the pressure change if your weight doubled?

Page 8: Pressure and Pascal’s Principle. PRESSURE! FORCE.

Pascal’s Principle

Any change in pressure applied to a completely enclosed fluid is transmitted undiminished to all parts of the fluid and the enclosing walls

Page 9: Pressure and Pascal’s Principle. PRESSURE! FORCE.

1 21 2

1 2

F FP P

A A 2

2 11

AF F

A

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2

21 1

1 2 2 22 2

20500F N

A rF F F

A r

2

1 2

(0.0120)20500 131( )

(0.150)F N

Page 11: Pressure and Pascal’s Principle. PRESSURE! FORCE.

Compare work??? Compare distance traveled by each piston?

Download Pascal worksheet from the website

Page 12: Pressure and Pascal’s Principle. PRESSURE! FORCE.

Practical use:A bottle of juice is sealed under partial vacuum, with a lid on which the red dot or “button” is painted. Around the button the following phrase is printed: “Button pops up when seal is broken”. Explain why the button remains pushed down when the seal is intact.

Page 13: Pressure and Pascal’s Principle. PRESSURE! FORCE.

Download gauge pressure worksheet from the website

Page 14: Pressure and Pascal’s Principle. PRESSURE! FORCE.

Gauge Pressure

F mg Vg gAhP gh

A A A A

Absolute pressure (including atmospheric)

oP P gh

Pressure in a fluid at the depth h

Page 15: Pressure and Pascal’s Principle. PRESSURE! FORCE.
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Page 17: Pressure and Pascal’s Principle. PRESSURE! FORCE.

What is the sub-atmospheric pressure in Pa and atm if the height of the Hg column in the barometer is 690 mm?

If the tube were doubled in diameter, what would happen to the height of the column?

How tall should a barometer be to measure normal atmospheric pressure if instead of Hg it is filled with water?

Page 18: Pressure and Pascal’s Principle. PRESSURE! FORCE.

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UB, Phy101: Chapter 11, Pg 1 Physics 101: Chapter 11 Fluids l Textbook Sections 11.1-11.6 è Density è Pressure è Pascal’s Principle l Textbook Sections.

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Chapter 9 The Behavior of Fluids - University of Oklahomaabbott/Phys-1114-Spring-2014/Chap9_Abbott.pdf · Pascal’s Principle Static fluid pressure is the basis of Pascal’s Principle:

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Fluids Pascal's Principle Measuring Pressure Buoyancynebula2.deanza.edu/~lanasheridan/4C/Phys4C-Lecture3.pdfFluids Pascal’s Principle Measuring Pressure Buoyancy Lana Sheridan De

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Physics 202 Lecture Notes - PCCspot.pcc.edu/~dulrich/2013p202/2013p202ln03.pdf · Pascal’s principle: any pressure change will ow through the entire uid equally Physics 202, Lecture

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Fluids Physics 202 Lecture 3. Pascal’s principle: any pressure change will flow through the entire fluid equally.

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Fluids I - SFU.camxchen/Phys1011104/Lecture24B.pdf · Fluids I Key points: •Pressure and Pascal’s Principle •Buoyancy and Archimedes’ Principle ... 3.5 N D) 0 N. Demo Weight

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Pascal’s Principle:

Pascal’s Principle: