I'm trying to think of a formal word to describe the "tipping point" of an object.
This would be the same point at which an object would be perfectly balanced.
More like sliding than tipping and (metaphorically) more to do with an objects 'place' in a hierarchy; added to the top (of the pile), it falls to the bottom.
Angle of Repose -Wiki
the maximum angle at which an object can rest on an inclined plane without sliding down.
If you have complaints; get in line, the suggestion box has reached an angle of repose.
I wavered on posting this, until I saw it linked to the tipping point wiki. A single word may exist that is more concise, but I believe that tipping point is the correct terminology.