Now, step number two is to actually figure out what these three forces are. Well recall from classical physics that we can represent the centrifugal force as simply. So our centrifugal force is equal to so the red force, F subscript C is equal to the mass of that object, the particle, the blue particle, which is assumed to be m multiplied by its acceleration. In this particular case, because we're undergoing angular motion, our acceleration is omega squared multiplied by R. Now, what is FB? What is the Boin Force? Well, once again, from classical physics, we know that the boine force is equal to not the mass of that particle, but the mass of the fluid that is displaced by that particle.