I am a very mathematical person. I excel in my mathematics courses. In physics, on the other hand, I have always felt less than an expert. I am by no definition a bad physics student. Being mathematically minded I see relationships easily. So physics is not difficult for me to do. What has always bothered me is an apparent lack of causality in the derivation of physics formula. Allow me to elaborate as that last statement is not concise. I understand the relationships between concepts; I do not understand how those relationships can be assured. For example, why does F=ma or for ohmic circuits V=IR. I believe I have come to an understanding of what is the source of this distress, and I believe it is purely theoretical. My observation, I came upon it while thinking about mechanics, but I believe is to be general and true for all branches of physics, is that if Newton had thought slightly differently we would be using different laws of physics. These laws would have the same meaning, but our calculated values and derived units would be completely different as would the calibration on our instrumentation. A self consistent system could be formed form the saying , for example, that F=m/a. One could then begin to derive all of mechanics from this and the definitions of mass and acceleration. These laws would appear differently, they would yield different derived units, and different calculated values for "forces". The base units (mass, displacement, time, etc) would remain the same. One could construct a fully self consistent experimental framework from this assumption as well as many others. Agree, disagree. Refutations? I'm interested to hear counterarguments.