Posted: Jun 15, 2011 10:14 am
I'm not sure it's accurate to claim that physics was initially philosophical and then became scientific. Physics, as termed by Aristotle, was a part of 'natural philosophy', which later became known as 'science', so whilst in a strictly literal sense it is true that physics went from being a 'philosophy' to 'science', this is simply because of a terminological change. To say that a field was once philosophical (i.e. it was a system of thought that was tested for logical consistency) but is now a science (i.e. a system dedicated to creating consistent empirical models about naturalistic claims) is really nonsensical since philosophy and science deal with different subject matter, use different tools, and have different ultimate goals.
If we were to claim that scientific fields emerged from philosophical thought, then certainly we could probably list nearly every branch of science, but I can't even begin to imagine how a philosophical field could become scientific. For example, I'm not sure how a field like the philosophy of mind could become scientific - what tests could or would we run to falsify dualism or to support materialism, etc?