Um... after learning physics you literally unstoppable. You could make it so anything traveling above a certain threshold would dead stop if it got near you. (bullet/missile proof)
jonnyt_
Even then it'd be scary, because you define it in a mathematical way. It's very easy to make a mistake. Programs always have bugs, but your "bugs" could destroy the universe, or at least yourself. Very powerful yes, but you have to be very sure of your equations. And whatever you do: don't divide by zero!
danielkinane
Simple solution. Just never use it. Nothing ventured, nothing lost.