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science chapter 11
forces in fluids
Question | Answer |
---|---|
pressure | the force exerted on a surface divided by the total area over which the force is exerted |
pascal | a unit of pressure equal to one newton per square meter |
fluid | a substance that can easily flow |
barometer | an instrument used to measure atmospheric pressure |
buoyant force | the upward force exerted by a fluid on a submerged object |
Archimedes principles | the rule that the buoyant force on an object is equal to the weight of the fluid the object displaces |
density | the ratio of the mass of a substance to its volume |
pascals principles | the rule that when force is applied to a confined fluid, the increase in pressure is transmitted equally to all parts of the fluid |
hydraulic system | a system that multiplies force by transmitting pressure from a small surface area through a confined fluid to a larger surface area |
Bernoulli's principle | a rule that a stream of fast moving fluid exerts less pressure than the surrounding fluid |
lift | an upward force |