Yes I suppose it could be a variant on my other thread. I am trying to add more detail to necessary scenes. Pacing isn't static? What does that mean?
It means you're going to have to do some revision. But as others have wisely said, that's all in the future. Right now all you have to do is tell the story in the way that feels most natural to you. That gives you the foundation from which to work. Like blacbird said, novels are built. They do have to be functional wholes, but they are also collections of component parts--your chapters need to have an arc, lead to each other, connect and resolve issues. So too each scene. Sometimes it's easier to just focus on what a given scene or chapter needs, then figure out how it leads to what's next.
Pacing is a part of how narrative is structured. If you're simply padding scenes to increase word count, it will, well, look like padding. That's the danger of word count trackers and obsessing over word counts. What you want is a dramatically functional story, one that's going to grip the reader whether it's barely 50K or 150K. And truth is, if you can manage that, the barriers around word-counts get much smaller anyway.
Pacing-wise, each scene should have its purpose. (So too each chapter, and the novel as a whole, once you have the thing drafted and can step back to see it fully.) Anything that doesn't fit that purpose is superfluous to the scene. But there are degrees--pace can be breakneck or languid. If my scene is about a very important tree, then I might choose to describe the hillside on which it's growing, or the grass at its foot, or the wilted leaves on one side--all of these provide more detail about the tree, the extra weight conveys importance, and though this
will add words, those words are functioning to make this tree a part of the larger story. Contrast the tree on fire, splitting and cracking and falling down. That scene, if it's more active, needs to be told quicker. More direct and powerful verbs, probably tighter sentences, and only enough detail to tell me that this is happening before the character runs to grab her camera and maybe a hose.
If you're worried about pacing, post an excerpt in SYW. Pacing is incredibly situational and context-dependent. There's no right way to do it. You have to gauge what the scene needs, what the story needs, and what the reader might need, too. None of this has any direct relevance to word count. It is, in fact, relatively easy to cut words later. Write the story the way you want to tell it. Until you write The End it's still a story, not a book, so don't try to make it one before you have the former.