L-14 Fluids . Why things float Fluids in Motion Fluid Dynamics Hydrodynamics Aerodynamics. Buoyancy – why things float. TITANIC. The trick is to keep the water on the outside of the ship, and to avoid hitting icebergs (which also float), and
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L-14 Fluids 
Why things float
Fluids in Motion Fluid Dynamics
Pressure increases with depth
that has a mass
The density of the
water is ρW
F = P A
The buoyant force on an object in
a fluid equals the weight of the
fluid which it displaces.
The weight of displaced
water is less than the
weight of the object
Only a thin layer of
water around the hull
is needed for the ship
Water, the most plentiful substance on earth is also one of the most unusual in its behavior in that it expands when it freezes.
Since it expands the density of ice is slightly less than the density of water (917 kg/ m3 as compared to 1000 kg/ m3 for water). So the part of the iceberg above the surface is less than 10% of the total volume.
Answer: The level stays the same.
Ice is less dense than water, so that
the volume occupied by the ice is
exactly big enough to hold the
volume of melted water that was
fluid flow example – leaky cup
with depth, so the
speed of water leaking
from the bottom hole is
larger than that from the
or m3/s volume flow rate
a pressure difference must be established
across the ends of the pipe to push the water
along. P2 must be greater than P1
This pressure difference can be set up by
a water pump.
This applies to pipes that have constrictions also.
When the wind is
really blowing, watch
the water level in the
toilet go up and down