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Unformatted text preview: low These
These help us make sense of the fundamental laws
that govern current flow. Physics 122 The fluid flow model
Key concept: Pressure
Recall: 1 2
– Pressure is like a tension but in 3D.
– It pushes in all directions at once,
so it has no direction.
– Forces due to pressure occur when you
only let it push on one side of an area. Then r
F = PA
Physics 122 Viscous Drag
A fluid flowing in a pipe doesn’t slip through the
The fluid sticks to the walls moves faster at the
middle of the pipe than at the edges.
As a result, it has to “slide over itself” (shear).
There is friction between layers of fluid moving at
different speeds that creates a viscous drag force,...
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- Spring '08