講者： 許永昌 老師 1. Contents Fluids and Density Pressure Pressure in Liquids (static) The pressure at depth d: p=p 0 +  gd. Buoyancy: Bernoulli’s Equation.

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Presentation transcript:

講者： 許永昌 老師 1

Contents Fluids and Density Pressure Pressure in Liquids (static) The pressure at depth d: p=p 0 +  gd. Buoyancy: Bernoulli’s Equation p+ ½  v 2 +  gh=constant. Elasticity 2

Fluids ( 請預讀 P442~P444) A fluid is a substance that flows. Gases: compressible. Liquids: ~incompressible. 3

Action: 4 Exercise: 1 m 3 =? cm 3

Pressure ( 請預讀 P445~P450) 5

Pressure (causes and properties) 6

Action: (P447) 7

Pressure in Liquids 8

Quiz The pressures at points 1 

Applications: ( 請預讀 P451~P455) Gauge pressure: p g =p - 1 atm. Manometers & Barometers: Hydraulic lift: 10 p0p0 F=pA 上升 d 2 高度所要花的力氣的 變化。

Exercise Textbook (P472) 11

Homework Student Workbook

Buoyancy ( 浮力 ) ( 請預讀 P455~P459) 13

Action: 14

Exercise Rank the scale readings. 15

Homework Student Workbook

Fluid Dynamics ( 請預讀 P459~P461) 17 (1)Never cross (2)

Flow tube Flow tube is a bundle of neighboring streamlines 18

Bernoulli’s Equation ( 請預讀 P462~P465) 19

Action: 20

Two applications ( 請預讀 P465) 21

Exercise Stop to think 15.6 (P466) Conceptual questions (P470) 22 v=? hAssume that A 1 >> A 2

Elasticity ( 請預讀 P466~P468) 23

Bulk Modulus We use this concept to predict the speed of sound: Adiabatic process for ideal gas: PV  =constant. We get Assume that p=P-P 0, we get Speed of sound 24

Homework Textbook Student workbook 請製作卡片。 25

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