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Forces in Fluids

This text explains the principles of fluid pressure, defined as the force exerted per unit area (P = F/A), measured in pascals (Pa). It clarifies that a fluid is any substance that fits the shape of its container, confirming that liquids and gases are fluids, while solids are not. The pressure at a given depth in a fluid is constant and exerted uniformly in all directions. Key factors affecting fluid pressure include depth and density. It also describes Charles' and Boyle's laws, illustrating with a pop bottle demonstration of how pressure changes with volume.

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Forces in Fluids

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  1. Forces in Fluids

  2. Pressure:the amount of force exerted per unit of area P=F/A A pascal (Pa) is the unit of pressure 1 Pa = 1N/m2

  3. Fluid a substance that assumes the shape of its container Is a liquid a fluid? YES Is a solid a fluid? NO Is a gas a fluid? YES

  4. The pressure in a fluid at any given depth is constant and is exerted equally in all directions.

  5. Factors Affecting Pressure Exerted by a Fluid Depth Density of Fluid

  6. Charles’ Law The volume of a gas increases with increasing temperature provided the pressure does not change. constant P T V

  7. Boyle’s Law If you decrease the volume of a container of gas the pressure of the gas will increase provided the temperature does not change constant P T V

  8. Pop Bottle Demonstration Shaking the bottle increases the pressure. Opening the bottle quickly decreases the pressure. This causes a rapid increase in volume.

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