Fluids Ch 3
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incompressible fluid + example
more fluid above an object= greater force exerted by fluid & greater pressure -ex: pool or lake
factors affecting change in pressure for incompressible fluid
-depth of and object in the fluid -density of the fluid
depth in pressure
increases
greater density
greater pressure
force & pressure
stronger force = stronger pressure
surface area & pressure + example
larger area= less pressure -walking on ice , laying down
compressible fluid -molecules of gas… -when they meet an obstacle -each collision -when you add up the force of each collision..
-molecules of gas move in random motion -when meeting a obstacle, they collide & change direction -each collision gas molecules exert a force on the molecule - add up the fporce of each collision and that becomes pressure of gas
more collisions
more pressure
things that affect # of collisions (2)
-# of gas particles -tempature ( +temp. , +movement, +collisions, +pressure -volume of a gas (how much space particle has to move)
lower volume…
higher pressure
as altitude increases (atmospheric pressure)..
pressure decreases
1st princple of a.p. -example
fluids move from high pressure to low pressure -ex: fire extinguisher, spray)
2nd principle -example
pressure applied to the surface of a fluid in a container gets evenly distrubuted to all fluid -ex: car brakes
3rd principle -example
trasnfer of presssure can increase the force -ex: hydraulic piston