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Density & Buoyancy

Density & Buoyancy. Chapter 11 Section 2. Density. Density = Mass/Volume What is the SI Unit for Mass? Volume? SI Unit for Density = kg/m 3 Also…g/cm 3 The Density of Water = 1 g/cm 3 Important to Remember…1 mL = 1 cm 3.

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Density & Buoyancy

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  1. Density & Buoyancy Chapter 11 Section 2

  2. Density Density = Mass/Volume What is the SI Unit for Mass? Volume? SI Unit for Density = kg/m3 Also…g/cm3 The Density of Water = 1 g/cm3 Important to Remember…1 mL = 1 cm3

  3. By Comparing Densities, you can predict whether an object will float or sink in a fluid.

  4. How do Submarines Float and then Sink?

  5. Buoyancy & Archimedes Principle • An upward force acting on a submerged object… opposite to the direction of gravity. • If weight of object is > than the buoyant force, the object will sink. • If weight of object is < than the buoyant force, the object will float. • Archimedes Principle = The Buoyant force acting on a submerged object is equal to the weight of the fluid displaced by the object.

  6. The pressure on the bottom of a submerged object is greater than the pressure on the top. The result is a net force in the upward direction.

  7. The block of wood weighs less that the weight of the water displaced.So if floats

  8. The Oak block sinks…we know that the weight of the wood is greater than the weight of the water displaced

  9. A balloon filled with air is more dense than surrounding air b/c under pressure. In hot air balloon, air is heated…making it less dense and therefore it floats.

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