sPeLL iT RiGhT

Salam...want to share something with u all..
ok..i want to ask u..how to spell "fizik" in english??
i mean the subject "fizik"..
is it p.h.y.s.i.c @ p.h.y.s.i.c.s ??
actually,lot of students make mistake to spell this word..
although he/she registered for this courses in university..

please distinguish both of this words;

physic  = A purging medicine; stimulates evacuation of the bowels.

physics = 1.The science of matter and energy and their interactions
          2.The physical properties, phenomena, and laws of something

-wallahu'alam...