lec8 - L ECTURE 8: F LUID F ORCES Buoyancy Drag & Lift...

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Unformatted text preview: L ECTURE 8: F LUID F ORCES Buoyancy Drag & Lift Cross-sectional area Density Speed Laminar and turbulent flow Curveballs Midterm information The buoyant force Hay Drag depends upon cross-sectional area Hay Goalies want a large cross-sectional area Hache Goalies position their cross-sectional area to block net Hache Reducing cross-sectional area in speed skating Hay. Drag opposes the motion; lift is perpendicular to the motion Hache Orient discus to maximize lift without too much drag Frohlich in Armenti Orient discus to maximize lift without too much drag Frohlich in Armenti Swimmers move arm forward in air and backward in water because... Hay Want large cross-sectional area on pull Hay. Ball Weight Diameter Terminal Speed Typical Speed (pounds) (inches) (mi/hr) (mi/hr) 16-lb shot 16 4.72 325 29 Football 0.91 11.1 6.8 100 55 Baseball 0.32 2.9 95 95 Golf ball 0.10 1.68 90 146 Softball 0.40 3.82 80 Handball 0.14 1.88 75 Tennis ball 0.13 2.56 70 120 Squash ball 0.07 .0048 55 Soccer ball 0.94 8.75 55 60 Basketball...
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This note was uploaded on 12/12/2011 for the course PHYS 17 taught by Professor Mcwilliams,r during the Fall '08 term at UC Irvine.

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lec8 - L ECTURE 8: F LUID F ORCES Buoyancy Drag & Lift...

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