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Understanding Buoyancy and Archimedes' Principle in Physics

Learn about buoyancy and Archimedes' principle in physics, including the upward force in fluids, displacement of water, floating objects, and more. Explore how objects float or sink based on buoyant forces and gravitational forces. Discover why helium balloons don't rise forever!

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Understanding Buoyancy and Archimedes' Principle in Physics

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  1. Buoyancy Net upward force is called the buoyant force!!! Easier to lift a rock in water!!

  2. Displacement of Water The amount of water displaced is equal to the volume of the rock.

  3. An immersed body is buoyed up by a force equal to the weight of the fluid it displaces. If the buoyant force on an object is greater than the force of gravity acting on the object, the object will float The apparent weight of an object in a liquid is gravitational force (weight) minus the buoyant force Archimedes’ Principle

  4. A floating object displaces a weight of fluid equal to its own weight. Flotation

  5. Flotation

  6. Buoyancy in a Gas Since air gets less dense with altitude, the buoyant force decreases with altitude. So helium balloons don’t rise forever!!!

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