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Cala3
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What is the buoyant force?
The buoyant force is the UPWARD force on an object from it's surrounding fluid. It determines the ability of an object to float in water.
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Why does buoyancy occur?
Becauze of the differences in pressure between the top of the object (pushing down) & the bottom of the object (pushing up)
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What is Archimedes principle of buoyancy?
When an object is partially/fully submerged in a liquid, the amount of water that it has displaces is equal to the amount of upward force produced by the fluid.
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Why do some objects sink, while others float?
- The reason objects sink is becauze the weight of the object is > than the amount of force being produced.
- If the force is > than it's weight, it will RISE
- if the force is = to the weight, it will float
- If the force is < than it's weight, it will sink
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Define pressure & how to measure it
- The amount of force per unit area.
- P=Force/Area
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How do fluids exert pressure in a container?
By molecules colliding with the walls of the container, each time exerting pressure
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What is the relationship b/w pressure & depth?
Pressure is proportional to the depth. The deeper, the more pressure because of more water being displaced.
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What is the relationship b/w pressure & density?
The pressure is = to the density of the object.
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Define viscosity.
It is the measure of how easily molecules pass eachother. If a fluid is more viscous, it means it will flow slower.
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How viscose a fluid is is dependent on what?
The attractive forces between molecules.
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Describe density in terms of mass & volume?
Density is how much mass is in a given unity of volume. The more mass per volume, the greater the density.
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What effect does density have on buoyancy?
The greater the density, the greater pressure
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What does the term displacement mean?
Refers to an object when it is fully immersed in water. When it is immersed it displaces fluid to 'fit' in the water.
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What will happen to an object with a positive buoyancy? Why?
It will float, because
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What will happen to an object with a negative buoyancy? Why?
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What will happen to an object with a neutral buoyancy? Why?
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What is the difference between cohesion & adhesion
- Cohesion refers to the attraction of like molecules to eachother (gay molecules)
- Adhesion refers to the attraction between unlike molecules (straight molecules)
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What is laminar flow? & turbulent flow?
- Laminar - when fluid flows in parrallel layers next to eachother with no disruptions. (ordered)
- Turbulent - has irregular movements of the particles. (in no order)
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Explain factors that cause fluid friction?
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What is bernoulli's principle?
When an incompressible fluid is put through a narrow restriction, it tends to flow fasted
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