Lecture 25 - Lecture 25 pls-25.1 Fluid Statics I Media: 1....

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Lecture 25 pls-25.1 Fluid Statics I Media: 1. Cu bar 2. Air pressure demos: (i) metal can, (ii) balloon in LN 2 (He then air), (iii) balloon in vacuum jar, (iv) balloon in “beaker”, (v) tank car video 3. Jar of water with three outlets 4. Shaving cream demo 1. Microscopic – Macroscopic Relationships —A theme throughout the rest of the course Example: Microscopic M a c r o s c o p i c a t o m i c m a s s d e n s i t y & atomic spacing 3 volume total mass total a m = ρ 2. Pressure Macroscopic picture : an object immersed in a fluid “feels” a force/unit area ( pressure) that is perpendicular to its surface at all points. This pressure wants to compress the object. m m a A F A F P = small, but macroscopic piece of surface
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Lecture 25 pls-25.2 Clicker question 1 . Microscopic picture : On average v r is perpendicular to surface Æ average force on molecules t m = v F r r is perpendicular to surface Æ (via N’s’ 3 rd law) average force on surface (from the molecules)
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This note was uploaded on 03/26/2012 for the course PHY 1020 taught by Professor Kodera during the Fall '11 term at University of Florida.

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Lecture 25 - Lecture 25 pls-25.1 Fluid Statics I Media: 1....

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