phys·i·cal·ly /-k(ə)lɪ/ 副詞
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.
adv : in accord with physical laws; "it is physically impossible"