Final answer:
The force that draws in the air at the center of the impeller and accelerates it outward is called the centripetal force.
Step-by-step explanation:
The force that draws in the air at the center or eye of the impeller and accelerates it around and outward is called the centripetal force.
According to the principles of circular motion, an object moving in a circular path experiences a constant inward force that keeps it on that path. In the case of the impeller, this force is necessary to counteract the inertia of the air and prevent it from moving in a straight line.
For example, in a centrifuge, a rapidly spinning machine used in laboratories, the centripetal force draws in the sample into the center and accelerates it outward, separating components based on their density.