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Bernoulli’s Principle For a fluid traveling // to a surface: LIQUID OR GAS …FAST-moving fluids exert LOW pressure …SLOW- “ “ “ HIGH FAST LOW P roof in hurricane SLOW HIGH P FAST LOW P SLOW “ HIGH P airplane wing / helicopter propeller FAST LOW P SLOW HIGH P frisbee AIR PARTICLES Resulting Forces (BERNOULLI’S PRINCIPLE) (GRAVITY) Bernoulli’s Principle Faster moving air on top less air pressure Low Pressure High Pressure LIFT Slower moving air on bottom high air pressure Air moves from HIGH pressure to LOW pressure Bernoulli’s Principle Fast moving fluid exerts low pressure. Slow moving fluid exerts high pressure. Fluids move from concentrations of high to low concentration. LIFT AIR FOIL (WING) Pressure exerted by slower moving air "Creeping" Shower Curtain CURTAIN COLD WARM SLOW FAST HIGH Pressure LOW Pressure TALL BUILDING FAST LOW P SLOW HIGH P WINDOWS BURST OUTWARDS windows and high winds (e.g., tornadoes)