premise: Physics has subfields.
hypothesis: Physics ( from [ φυσική , phusikḗ ( epistḗmē ) , knowledge of nature ] , from φύσις phúsis `` nature '' ) is the natural science that involves the study of matter and its motion and behavior through space and time , along with related concepts such as energy and force . Physics intersects with many interdisciplinary areas of research , such as biophysics and quantum chemistry , and the boundaries of physics are not rigidly defined .