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Forces in Fluids

Forces in Fluids. Chapter 13 Section 1 Physical Science Hirsh. Fluid Pressure. Pressure - the result of a force distributed over an area The smaller the area the greater the force Bike seat verse couch seat Pressure = force /area

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Forces in Fluids

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  1. Forces in Fluids Chapter 13 Section 1 Physical Science Hirsh

  2. Fluid Pressure • Pressure- the result of a force distributed over an area • The smaller the area the greater the force • Bike seat verse couch seat • Pressure = force /area Units: Pressure is in Pascal (Pa) or kilopascals(kPa) [1kPa = 1000 Pa] Force is in Newtons (N) Area is in m2 • Force = mass x acceleration • Area = length x width

  3. Calculating Pressure A box with a weight of 2700 N is resting on the ground. If the area of the box touching is 1.5 m2, what pressure does the box exert on the ground? Pressure = force / area Pressure = 2700 N / 1.5 m2 Pressure = 1800 Pa how many kPa is this? Pressure = 1.8 kPa

  4. Calculating Pressure A book with a weight of 12 N rests on its back cover. If the back cover measures 21 cm by 28 cm, how much pressure does the book exert? Pressure = Force / Area Pressure = 12 N / (.21 m x .28 m) Pressure = 12 N / .059 m2 Pressure = 203.3 Pa Pressure = .203 kPa

  5. Pressure in Fluids A fluid is a substance that assumes the shape of its container. Both liquids and gases Examples??? What happens to the pressure as you swim down deeper in a pool? Water pressure increases as depth increases The pressure in a fluid at any given depth is constant

  6. Air Pressure As you increase in altitude, does your pressure increase or decrease? As you increase in altitude, the air pressure decreases, there is less air on top of you

  7. Air Pressure Why do your ears pop on an airplane? Outside pressure changes more quickly than your ears can adjust to This creates a difference in pressure between the inside of your ear and the outside of your body The air has to pass through a small tube in your ear to equalize the pressure and that is the popping sensation that you feel

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