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ILS Ch 13
Question | Answer |
---|---|
Pressure | force /area, measured in pascals |
1N/m2 | 1Pa |
Fluid pressure | increases with depth, depends on the type of fluid |
Fluid | any liquid or gas, can not compress a liquid |
Atmospheric pressure | caused by weight of atmosphere above a location, sea level =101 kPa |
Pascal’s principal | change in pressure of a fluid is transmitted equally in all directions |
Hydraulics | multiply force, based on Pascal’s Principal, diagram, fluid pressure is constant |
Bernoulli’s Principal | as the speed of a fluid increases, pressure decreases, diagram |
Lift | upward force on a wing, air above the wing moves faster than the air below |
Buoyant force | upward force on an object in a fluid, strength depends on volume, equals the weight of the fluid displaced by the object, causes loss of weight |
Archimedes Principal | buoyant force equals weight of fluid displaced by an object |
Sink | density of object is greater than density of fluid, weight is greater than buoyant force |
Float | density of object is less than the density of the fluid |
Air pressure | decreases with altitude |
Density – determines if an objects sinks or floats | |
Area – length x width, m2 | |
Diagram of spheres |