Being braked is a sufficient, but not a necessary, condition for changing forward-motion gears.
A simple approximation may be more useful than a complicated exact expression.
Come-on graphics typically feature rhetorical lack of proportionality. For example, a beginner’s atlas shows children as being as big as continents, and vehicle ads show price tags the size of the vehicles.
The purpose of hierarchy is to eliminate gridlock.
There is a universal trend towards gridlock. The term ‘entropy’ refers both to that trend, and to the current degree of gridlock of a given system, depending on context.
Definition: A resource, such as energy, that is gridlocked is said to be unavailable.
phenomenon: the drift toward gridlock