Chapter Five: Density and Buoyancy 5.1 Density 5.2 Buoyancy 5.3 Heat Affects Density and Buoyancy.
Density & Buoyancy
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Density & Density & Buoyancy Buoyancy Chapter 11 Section 2 Chapter 11 Section 2
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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. - PowerPoint PPT Presentation
Transcript of Density & Buoyancy
Density & Density & BuoyancyBuoyancy
Chapter 11 Section 2Chapter 11 Section 2
DensityDensityDensity = Mass/VolumeDensity = Mass/Volume
What is the SI Unit for Mass? Volume?What is the SI Unit for Mass? Volume?
SI Unit for Density = kg/mSI Unit for Density = kg/m33
Also…g/cmAlso…g/cm33
The Density of Water = 1 g/cmThe Density of Water = 1 g/cm33
Important to Remember…1 mL = 1 cmImportant to Remember…1 mL = 1 cm33
By Comparing Densities, By Comparing Densities, you can predict whether an you can predict whether an object will float or sink in a object will float or sink in a
fluid.fluid.
How do Submarines Float How do Submarines Float and then Sink?and then Sink?
Buoyancy & Archimedes Buoyancy & Archimedes PrinciplePrinciple
An An upward forceupward force acting on a acting on a submerged object… opposite to the submerged object… opposite to the direction of gravity.direction of gravity.
If weight of object is > than the buoyant If weight of object is > than the buoyant force, the object will sink. force, the object will sink.
If weight of object is < than the buoyant If weight of object is < than the buoyant force, the object will float.force, the object will float.
Archimedes PrincipleArchimedes Principle = = The Buoyant The Buoyant force acting on a submerged object is force acting on a submerged object is equal to the weight of the fluid equal to the weight of the fluid displaced by the object.displaced by the object.
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.
The block of wood weighs The block of wood weighs less that the weight of the less that the weight of the
water displaced.water displaced.So if floatsSo if floats
The Oak block sinks…we The Oak block sinks…we know that the weight of the know that the weight of the
wood is greater than the wood is greater than the weight of the water weight of the water
displaceddisplaced
A balloon filled with air is A balloon filled with air is more dense than more dense than
surrounding air b/c under surrounding air b/c under pressure. In hot air pressure. In hot air
balloon, air is heated…balloon, air is heated…making it less dense and making it less dense and
therefore it floats.therefore it floats.
