The typical example of this is "I push on the wall with a force \(\vec{F}\), so the wall pushes on me with a force \(-\vec{F}\)''. Mathematically, if we have a force \(\vec{F}_{AB}\) acting from objec...The typical example of this is "I push on the wall with a force \(\vec{F}\), so the wall pushes on me with a force \(-\vec{F}\)''. Mathematically, if we have a force \(\vec{F}_{AB}\) acting from object A to object B, Newton's third law tells us that we know there must be a force \(\vec{F}_{BA}\) acting from object B to object A.