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Forces in Fluids

Forces in Fluids. Chapter 3, Section 1 Pressure. What is pressure?. It is a force exerted over an area on the surface of an object. Gravity pulls you down with a force equal to your weight. Your feet then exert a force on the surface of the earth over an area the size of your feet.

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Forces in Fluids

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  1. Forces in Fluids Chapter 3, Section 1 Pressure

  2. What is pressure? • It is a force exerted over an area on the surface of an object. • Gravity pulls you down with a force equal to your weight. • Your feet then exert a force on the surface of the earth over an area the size of your feet.

  3. Pressure and Area • Pressure decreases as the amount of area covered increases • The greater the area being covered, the less the pressure on a given spot of that area. • Ex. – Boots vs. Snowshoes

  4. Calculating Pressure • Pressure = Force/Area (P=F/A) • Pressure is the force exerted on the surface of an object divided by the total area. • Force is measured in Newtons (N) • Area is measured in square meters (m2) • Pressure is labeled N/m2

  5. Fluid Pressure • A fluid is a material that can easily flow. • Fluid can change shape depending upon the container. • Particles (atoms) in a fluid constantly move in all directions. • Fluid pressure is the total force exerted by the fluid divided by the area over which the force is exerted.

  6. Air exerts pressure because it has mass. • Air presses down on everything on Earth. • Balanced Pressure • Pressure at a given point is given equally in all directions. • The weight of the atmosphere (air) is pressing on you in all directions – the pressures balance each other out.

  7. Variations in Fluid Pressure • As your elevation increases, atmospheric pressure decreases • Can cause your ears to pop • Going up in a plane • Going deep under water • The pressure becomes greater the further under water you go.

  8. Measuring Pressure • Barometer – used to measure atmospheric pressure • Decreasing atmospheric pressure usually means a storm is coming. • Increasing atmospheric pressure usually means fair weather

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