Fluid in Rigid Body Motion

There is no relative motion between fluid parcels → no shear or friction

• $\rho a=\rho g-\nabla P+f_{fric}$

This looks like this…

Acceleration

When a tank of liquid undergoes rigid body motion, the slope of the fluid gives us the acceleration
$\frac{a_x}{g}={\frac{\Delta y}{\Delta x}}_{}$