article mostly pound general mass force distinction due historical treatment weight perhaps numerous incarnations pound generic pound article pound mass similar category unit mass specific system case pound mass member fps gravitational system units link pound mass article pound article course deserves better treatment fps engineering system table fps systems pound force slug mass tabulates various fps systems little less clear used simply called fps engineering engineering absolute fps gravitational system units apparently clambering credibility calling engineering gravitational system course use engineering due offence newton law gravitational system come maybe reliable sources order