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units

units

(OP)
Hello Everyone,

When applying gravity loads in Pro Mechanica, it seems logical to me to select a unit system that that uses mass/length^3 units not force/length^s.  Therefore when operating in English units I would like to use slugs/ft^3 for density.  I feel like using pounds already incompasses the earth's gravity....what if I want to do an analysis on a shuttle operating in the moon's atmosphere?  I believe that 1 lbm = 1 lbf at g = 32.2 ft/sec^3, how ever this equivalence is lost at other magnitudes of gravity....someone please set me straight on this issues, because I am sure it is a relatively simple piece of info I am over looking.

Thanks,

Dane

RE: units

Use SI units.

Best regards,

Matthew Ian Loew


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