This got beaten into me in high school and college physics. The minute you said "weigh"...Anyway. As someone else points out, until excursions into non-1-g environments are common, folks won't use mass as a verb.
That being said, colloquially, it seems like people treat things weighing a pound in 1g as massing one 'pound', and pound as a unit of force is getting to be a more specialized usage. (Hunh: wikipedia agrees, emphatically. This must be in more common usage now than it was in said physics classes -- or wp got swamped by a "pound-force" advocate.)
(no subject)
That being said, colloquially, it seems like people treat things weighing a pound in 1g as massing one 'pound', and pound as a unit of force is getting to be a more specialized usage. (Hunh: wikipedia agrees, emphatically. This must be in more common usage now than it was in said physics classes -- or wp got swamped by a "pound-force" advocate.)