Is there an opposite of centrifugal force?
It depends on what you mean by “centrifugal force.” In one sense, it is the fictitious force one experiences in a rotating reference frame, and it has no opposite. A centripetal force, on the other hand, is the force that keeps an object moving along a circular path. Its opposite is the contact force that the moving object exerts on the restraining object, and that contact force is called the reactive centrifugal force. So if that was what you initially meant by centrifugal force, then its opposite is the centripetal force.
