Source : Webster's Revised Unabridged Dictionary (1913)

Physically \Phys"ic*al*ly\, adv.
   In a physical manner; according to the laws of nature or
   physics; by physical force; not morally.

         I am not now treating physically of light or colors.
                                                  --Locke.

   2. According to the rules of medicine. [Obs.]

            He that lives physically must live miserably.
                                                  --Cheyne.

Source : WordNet®

physically
     adv : in accord with physical laws; "it is physically impossible"