Philosophical implications of Newton’s laws

I don’t have the time or, frankly, the inclination to deal with philosophy of science in a physics class.  Most of day-to-day physics is pretty practical, and the fact that Newton’s laws work (to the precision we require in most applications) is generally justification enough to use them.  However, people with a more highly developed philosophical sensitivity than mine may be concerned that Newton’s laws seem to rely on circular reasoning.  You can check out a lightweight summary of the issues involved; if that doesn’t dissuade you I suggest you take it up with the Department of Philosophy.