Fluid Pressure fluid pressure is essential for us

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Fluid Pressure • fluid pressure is essential for us to do work – fluids

Fluid Pressure • fluid pressure is essential for us to do work – fluids always go from a point of high pressure to lower pressure – this movement of the fluid (a gas or liquid) can move objects along with it fluid pressure differences control weather air masses move from areas of high pressure to low pressure

rd a h w o h s i e c r … h s

rd a h w o h s i e c r … h s Fo u you p red in u s a e ) N m ( s n o t New N/m 2 is called a pascal (Pa) Are a is are how a th wid spre e for e an usu ad o ce is ally ver… mea sure m 2 d in

Compression Counts • gases can exert a counterforce which absorbs force air mattress shock

Compression Counts • gases can exert a counterforce which absorbs force air mattress shock ab s tires orbers air bag • we can compress a gas, then release it to do work nail gun air bag piston fire extinguisher

Compression of Liquids & Solids • the particles of liquids and solids are closer

Compression of Liquids & Solids • the particles of liquids and solids are closer together … so its harder to compress them • liquids → power washer or even a nozzle on your garden hose • solids → incompressible

Fluid Systems we use fluid under pressure to do work for us … how

Fluid Systems we use fluid under pressure to do work for us … how does that work?

Unbalanced Forces • if the inside of a closed container experiences lower pressure the

Unbalanced Forces • if the inside of a closed container experiences lower pressure the walls of the container will collapse • if the inside of a closed container is under pressure… the fluid will rapidly escape when the pressure is released!

Atmospheric Pressure • gravity keeps an envelope of air around the Earth • but

Atmospheric Pressure • gravity keeps an envelope of air around the Earth • but since air pressure outside your body is the same as inside… you don’t even it – unless you fly/climb high air pressure ↓ – or dive deep air pressure ↑ – we have a membrane in our ear to help us equalize when air pressure changes

Barometer • used to measure air pressure • as pressure increases the mercury is

Barometer • used to measure air pressure • as pressure increases the mercury is pushed higher • as pressure decreases mercury falls lower

Fluid Systems

Fluid Systems

Hydraulics

Hydraulics