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Pressure clarified

Learn how gravity, density, and depth affect liquid pressure. Explore the Pressure Equation and Buoyant Force. Understand Archimedes' Principle and why objects sink or float based on density and buoyant force.

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Pressure clarified

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  1. Pressure clarified

  2. Pressure • What affects the pressure of a liquid? • Gravity • The density of the liquid • The depth of the liquid

  3. Pressure • Remember when I told you that pressure increased when you went farther down in the water… Well how does pressure relate to depth if pressure is force divided by area…

  4. Pressure Equation Derived • P = F/A = force / area • Force/area = weight/area • Weight/area = weight density xvolume/area • = weight density x area x depth / area • = weight density x depth • THEREFORE: Pressure = weight density x depth **Weight density = density x gravity

  5. Buoyant Force and Archimedes Principle

  6. Buoyant Force • Upward force that the fluids exerts • Opposite to gravity • Recall that forces are greater at greater depth • Thus, results from the difference of the upward and downward forces applied to a submerged object • Since the upward forces come from deeper in the liquid, the object is pushed up making is lighter

  7. Buoyant Force Bigger Buoyant force in deeper liquids

  8. Why do I feel lighter in water? • Because the buoyant force pushes up against gravity, making you seem lighter in water

  9. Which one is easier to pick up? Why?

  10. Archimedes’ Principle • An immersed object is buoyed up by force equal to the weight of the fluid it displaced.

  11. Displaced Water • the amount of liquid pushed aside by a submerged object • volume of liquid displaced equals the volume of the submerged object • the depth of the liquid is increased by the submerged object because the liquid rises.

  12. Archimedes Principle Common language: The buoyant force of an object is equal to the weight of the displaced The weight of this volume is equal to the buoyant force.

  13. Weight: Sink or Float • When the weight is less than the buoyant force, the object will… rise to the surface and floats • When the weight of a submerged object is greater than the buoyant force… it sinks

  14. See how the buoyant force works Object floats because the buoyant force is bigger than weight Sinks. Why?

  15. Density: Sink or Float? • If the object is less dense than water… it floats • If the object is more dense than water… it sinks • If it has the same density as water, it doesn’t sink or float… like a fish

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