And so it will push it slightly outward. And so instead of being here, that particle will be located here. And as our object rotates, this particle basically keeps on moving outward. And the density, the mass, the shape and the size of the particle basically determines the rate at which it moves outward, as we'll see in just a moment. So said another way, we can imagine that there's this force known as the centrifugal force that points outward and it's that force that causes it to move outward along our test tube. So we have this force due to the fluid, let's say force resistance, that basically acts on that object and it causes it to move this one.