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Notes 11-1

Notes 11-1. Pressure. What Is Pressure?. The amount of pressure you exert depends on the area over which you exert a force. Calculating Pressure. Pressure = Force Area = Length x Width Area. Units: Force- Newton (N) Area-square meters (m 2 ) Pressure- Pascal (Pa).

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Notes 11-1

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  1. Notes 11-1 Pressure

  2. What Is Pressure? • The amount of pressure you exert depends on the area over which you exert a force.

  3. Calculating Pressure Pressure = Force Area = Length x Width Area Units: Force- Newton (N) Area-square meters (m2) Pressure- Pascal (Pa)

  4. The area of a surface is the number of square units that it covers. To find the area of a rectangle, multiply its length by its width. The area of the rectangle below is 2 cm X 3 cm, or 6 cm2. Area

  5. Practice Problem Which has a greater area: a rectangle that is 4 cm X 20 cm or a square that is 10 cm X 10 cm? The square has the greater area. 4 cm X 20 cm = 80 cm2 10 cm X 10 cm = 100 cm2 Area

  6. Fluids • A material that can easily flow. • Examples? • Liquids • Gases • Tiny particles are constantly moving and colliding with surfaces, which exerts forces on the surfaces.

  7. Fluid Pressure • All of the forces exerted by the individual particles in a fluid combine to make up the pressure exerted by the fluid.

  8. Air Pressure • Right now, there is approximately 100 km of fluid on top of you… • AIR! • The weight of the air exerts a force which causes air pressure or atmospheric pressure. • Why are you not crushed by these fluids? • The forces are exerted from all directions so they are balanced.

  9. Variations in Fluid Pressure • As your elevation increases, atmospheric pressure decreases.

  10. Variations in Fluid Pressure • Water pressure increases as depth increases.

  11. Measuring Pressure • You can measure atmospheric pressure with a barometer • Meteorologists use barometers to measure pressure to help forecast the weather • Decrease in pressure = storm

  12. Air Pressure and Altitude • http://youtu.be/7_yf-iRf8Vc

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