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Fluids
Why do things feel
lighter when they
are under water?
Buoyant Force
Archimedes’
Principle
Buoyant force = weight
of fluid displaced
Archimedes Example
Gas bladder (swim
bladder) in fish
To attain neutral
buoyancy
Pressure in Fluids
Constant movement of
particles exerts
pressure as they collide
with a surface
Pascal’s Principle
Pressure applied to fluid
in a closed container is
equally transmitted to all
parts of the fluid and the
container.
Think toothpaste…
Applications of
Pascal’s Principle…
Hydraulic lifts – auto
shop, barber chair, etc.
Bernoulli’s Principle
The pressure in a fluid
decreases as the fluid’s
velocity increases.