The Law of Inertia (and small children)

Okay, so I have just enough physics education to be dangerous.  The Law of Inertia, when applied to small children, every parent though is familiar with even if they don't recognize it in those terms.  I'm just going to plagiarize the rules of physics to put it further into words. 

The Law of Inertia according to Wikipedia:
"In common usage the term "inertia" may refer to an object's "amount of resistance to change in velocity" (which is quantified by its mass), or sometimes to its momentum, depending on the context."

Here's the equation for momentum:
p = mv

Now tailored for small children:
where p equals your ability to actually get your kids out the door by a certain time
where m = the amount of resistance your child provides by taking thirty times as long to do something that normally takes them two seconds or the ability to break down into an unexpected (completely unnecessary) tantrum
and where v = the speed you actually need to get out the door to make some deadline or appointment

And yes, the relationship is inversely proportional... Meaning the sooner you need to actually get out the door (smaller v), the harder your children makes it for you to get out the door on time (gigantic m).

And yes, generally, p is constant, meaning:
1. If it doesn't matter, you'll get out the door with little mess and probably on time.
2. If you are going to be embarrassed by being that parent who shows up twenty minutes late for appointment and throws the entire day's worth of appointments into a tizzy, you're never going to make it there on time.

So in the end, I salute any and all parents who make it to appointments on time (or even somehow early!) with their kids.