When two forces go in the opposite direction, it's called opposing forces or forces in equilibrium.

Here's a breakdown:

* Opposing forces: This is a general term that simply means two forces acting in opposite directions.

* Forces in equilibrium: This term implies that the two opposing forces are equal in magnitude. This means they cancel each other out, resulting in a net force of zero.

Let me know if you'd like me to give you some examples of opposing forces!