I am a Doctor and i am trying to prove a theory concernicg centripetal movements of epithelial stem cells in the human cornea. However my research is about the pterygium, a degenerative lesion of the cornea. I ve proven to be of parabolic form and i know from literature that corneal stem cells are drawed into the cornea by centripetal forces. I found from the book I "motion of the bodies" in the propositions that a body can move in a parabola by centripetal forces. My question is quite simple and basic. I would like to know if there is a fundamental law that states that when a body or particle is entered in a field that certain laws of physics exists, then the body or particle must obay them. Thank you very much.