In my opinion, there are no static or dynamic functions - only socionics types are static or dynamic.
I'd like to use the example of Fe. I would say that an INTj perceives Fe in a static way, whereas an ESFj perceive Fe in a dynamic way. For the purposes of this thread I would like to make Fe synonymous with mood.
An ESFj perceives mood as a continuum rather than separate states. Transformation of mood from one state to another is continuous. INTps perceive mood in the same way.
An INTj perceives mood as distinct states, rather than one state transforming into another.
On their own, an INTj would get stuck in a certain mood and remain in it for long periods. This is why it is useful for an INTj to have an ESFj as a dual, who would pull them out of that mood. Similarly, it is useful for an ESFj to have an INTj as a dual who would help in stabilizing the ESFjs mood.