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32-fluids

32-fluids - Phys 211 Chapter 14 Fluids Fluids What is a uid...

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Phys 211 4/13/09 Chapter 14 Fluids

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Fluids What is a fluid ? Anything that flows / take the shape of its container: blood, air, lava Uses of fluids: hydraulic lift barometer blood pressure airplane flight sports We will discuss incompressible fluids Instead of mass and force use density and pressure
Density mass per unit volume (kg/m 3 ) consider the motion of a “ mass element Δ m = ρ ( Δ V ) Δ V ρ Newton’s Laws apply!

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Density Which one of the following objects has the largest mass? a) a iron solid cube with each side of length r b) an ice solid sphere of radius r c) an iron solid cylinder of height r and radius r d) an ice solid cube with each side of length r e) an iron solid sphere of radius r
Pressure Use a mechanical sensor to illustrate/define pressure Δ p = Δ F Δ A Δ A 0 p = F A Units: N/m 2 = Pa (Pascal) Air Pressure We live at the bottom of a “sea” p 0 =14.7 lbs/in 2 (psi) ~ 760 mm Hg (torr) ~ 1.01E5 Pa What happens to pressure as you go up in elevation?

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Demonstration
Bed of Nails

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