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prezi test

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Carson Cheung

on 29 April 2010

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Transcript of prezi test

Pressure (Pa) liquid/gas P= F/A Force (N) a push or a pull can be balanced
=> no movement can compress fluids can deform solids ex. Buoyancy the tendency to float or sink
in a fluid because of difference
in densities Boyant force
the force a fluid pushes up
on a object changes with altitude/ depth pressure in fluids ex. drinking from straw an area of low pressure is created in your mouth

the relatively higher pressure of the
surrounding atmosphere


the juice into your mouth. Convection ex. spray bottle
pumping is to build up
pressure inside the bottle.
(b)The pressure inside the bottle becomes
greater than the pressure outside. This
results in fluid being forced from the area
of high pressure in the bottle to the area of
low pressure outside the bottle.

when pressure is applied at one point to a
fluid in an enclosed system, that pressure
is transmitted equally through the entire
staticpressure fluid under pressure can apply a force
even though it is not moving dynamic pressure Valve controls the flow of fluids Hydraulic multiplication incompressible fluid increases and
transmits a force from one point
to another
1. twists and turns in the pipes increases
resistance to flow of fluid

2. leaking pipes

3. system affected by size of pipe

4. particles in fluid losses energy (slows down)
as the particles brush past each other

5. pipes can wear off The use of gas (usually air)
in an enclosed system under pressure. Pneumatic System The enclosed gas transmits a force,
causing motion. Advantages of
Hydraulics and Pneumatics •Highly compressed air delivers great force to the braking system.
•Pipes and tubes deliver the force to many places at once.
•Hydraulic multipliers in the wheels increase the force that stops the vehicle.
ex. precision drills
used by dentists Circulatory System pump = heart
pipes = blood vessels
valves blood pressure
measured by
Adolescent: 120/75 mm Hg Respiratory System a gas moves from an area of high pressure to an area of low pressure
avg: about 500 mL
capacity: 2000mL Problems: Clogged or swollen passageways due to bacteria/ viruses/ micro-organisms
as the speed of a fluid increases, the pressure exerted perpendicular to the motion decreases A fluid in motion has dynamic
pressure, which is energy that can
be used directly to perform tasks Natural Fluid Systems Problems:
is a vertical movement of fluids
caused by density differences.
These movements cause heat to be distributed evenly throughout the fluid one atm at sea level Hydraulic System The pump forces water through a
pipe into a pressure tank.

As more and more water enters the tank,
it pressurizes the small amount of
air in the tank.

When the appropriate pressure is
reached, the pressure tank sends an electrical signal
to turn the pump off.

The pressure tank transmits
water under pressure through the entire system, so
whenever you open a tap, water flows out of it
under pressure.
air movement
cannot be blocked Properties of pressure
in fluids: Blaise Pascal (French@1600): gives rise to understanding of Daniel Bernoulli
(Swiss @ 1700): gives rise to understanding of Devices that
create pressure that
moves through a LIQUID example Hydraulic problems: Pneumatic problems: Fluid Systems
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