Trying to understand the basics of fluid dynamics after reading up on Bernoulli's principle. One thing I'm caught on. If I know the velocity of an incompressible fluid at a given point, and the force it exerts on a given mass at that point, can I then determine the density of the fluid, or would I need more information? Conversely, if I know the density of the fluid, and the velocity, can then I then determine the force it will exert on a given mass in its path? Thanks for any guidance on this.