The static case for F=ma
says that the acceleration of an object is zero and so the force on it
is zero too. Apply this to a fluid and you get
Is the sign right? That depends on how you choose your coordinates; is y
measured positive up or positive down?
Fluids are buoyant because the pressure in
the fluid is more on the bottom of an object than it is on the top. That
provides a net force from the fluid that is upward. It's called the
"buoyant force," but it is just a special case of contact between the
fluid and the thing it's acting on. Section 16-4 explains the details of
this application. Why do you float in water (if you do)?
Fluid flow at least along a straight line
in 16-6.
ch 11: Section 11-4 is what you need from this chapter. Stress and Strain, the "Poisson Ratio" is not needed, though it's worth reading about.
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