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13.1 Fluid Pressure

13.1 Fluid Pressure. Pressure- force distributed over an area; Pressure= F/area Pressure in Fluids Water pressure increases as depth increases The pressure of any fluid at specific depth is constant and equal pressure in every direction

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13.1 Fluid Pressure

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  1. 13.1 Fluid Pressure • Pressure- force distributed over an area; Pressure= F/area • Pressure in Fluids • Water pressure increases as depth increases • The pressure of any fluid at specific depth is constant and equal pressure in every direction • Fluid pressure determined by type of fluid and depth (volume or weight does not affect pressure!) • Air Pressure in Atmosphere • Air pressure decreases as altitude increases • Atmosphere exerting 1000N of pressure on you!

  2. 13.2 Forces & Pressure in Fluids • Pascal’s Principle: a change in pressure at any point in a fluid is transmitted equally and unchanged in all directions through fluid • Hydraulic Systems • Increases output force due to constant fluid pressure exerted over larger area of the output piston http://www.google.com/imgres?q=hydraulic+lift+system+piston&hl=en&biw=1024&bih=692&tbm=isch&tbnid=nBhunNaz9GrRXM:&imgrefurl=http://www.cramster.com/answers-nov-10/physics/hydraulic-lift-designing-hydraulic-lift-automobile-garage_1036604.aspx%3Frec%3D0&docid=NggXiNge0HQo6M&imgurl=http://s3.amazonaws.com/answer-board-image/53a90a44-d431-47ca-94ba-8772efc9500a.jpeg&w=348&h=299&ei=XkI-T6rbAoXqtgfN4NTYBQ&zoom=1&iact=hc&vpx=245&vpy=296&dur=1377&hovh=208&hovw=242&tx=148&ty=225&sig=105865835399718163433&page=5&tbnh=166&tbnw=193&start=76&ndsp=20&ved=0CL4DEK0DMFc

  3. 13.2 Forces & Pressure in Fluids • Bernoulli’s Principle: as the speed of fluid increases the pressure within the fluid decreases • Airplane wings/ lift • Air over top of wing is faster then air passing under • Pressure difference causes lift= keep flying • Spray bottles • Pressure difference from chamber and tube forces solution up tube and mixes with water moving out bottle

  4. 13.3 Buoyancy • Buoyancy results in the apparent loss of weight of an object in a fluid. • Buoyant force- upward force acting against gravity • Archimedes’ Principle-buoyant force of an object = weight of the fluid displaced by the object • Density and buoyancy- object less dense than liquid floats; object is more dense than liquid it sinks; suspended if object has same density as liquid

  5. 13.3 Buoyancy

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