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Forces in Fluids

Forces in Fluids. Fluid pressure Bouyancy Hydraulics Bernoulli’s Principle. Fluid Pressure. Exerts a “ push ” on an object Acts in all directions. the air holds the card up so the water doesn't spill!. Pressure. Force that acts over a certain area. F

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Forces in Fluids

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  1. Forces in Fluids Fluid pressure Bouyancy Hydraulics Bernoulli’s Principle

  2. Fluid Pressure • Exerts a “push” on an object • Acts in all directions the air holds the card up so the water doesn't spill!

  3. Pressure • Force that acts over a certain area. • F • P A • Pressure = Force ÷ Area • Force is measured in Newtons, area in cm2, so pressure is N/ cm2.

  4. Example problem • A woman weighs 750N. She is standing on high heels with a total area of 2cm2 touching the ground. How much pressure does she exert? • F 750N • P A P 2cm2 • 750N ÷ 2cm2 = 375N/cm2

  5. Example problem 2 • An elephant weighs 75,000N. She is standing on 4 big feet. Each foot is 50cm in diameter. How much pressure does she exert? • Area of feet = 4·π·d = 628cm2 • F 75,000N • P A P 628 cm2 • 75,000N ÷ 628cm2 = 119 N/cm2

  6. How can this be? • An elephant weighs 100 times as much as a woman, yet it exerts less pressure on the floor?

  7. Bouyancy • Force of a fluid that pushes up on an object. • Makes the object seem lighter

  8. Archimedes Principle • The buoyant force on an object is equal to the weight of the fluid displaced. • An object will float in a liquid if the density of the object is less than the density of the liquid.

  9. If the weight of the water displaced is less than the weight of the object, • the object will sink • Otherwise the object will float, • with the weight of the water displaced equal to the weight of the object. • Archimedes' Principle explains why steel ships float

  10. Will It Float? Is it buoyant? The density of the granola bar is greater than the density of the water.

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