Erin's three laws of motion

Isaac Newton didn't invent his laws of motion.  He observed them.  I, likewise, have observed the following three laws that children seem to follow:

1)  Children in motion tend to stay in motion, unless some external force (such as bedtime) stops them.  Children at rest tend to stay at rest unless some external force dumps them out of bed.  (This phenomenon has a direct relationship to age.  In very little children, inertia is always ready to convert instantaneously into momentum.)

2)  The more mass (and therefore age) a child has, the more difficult it will be to accelerate him (for instance, into helping with chores.)  The less mass a child has, the more willing he will be to "help".

3) Every action will have a loud and opposite reaction. 

I feel relieved, in a way, to know that there are at least some rules that they're following. Even if it is only three.

~MB~