Posted by MarkB_MI on July 16, 2016 at 16:34:58 from (70.194.0.244):
In Reply to: Re: DOT?? posted by dpendzic on July 16, 2016 at 16:08:12:
> I always thought that mass is weight divided by gravity, which is usually 32.2 here on earth, and isn't force measured in Newtons??
Well, for starters you're mixing English and metric units. The acceleration of gravity is indeed 32.2 ft/s2. But newtons are the metric unit of force, so you would use the metric value for the acceleration of gravity, which is 9.8 m/s2.
But George isn't working in metric units; the French hadn't invented the metric system back when he took physics, so he's working entirely in English units. Here's the deal with the English system: there are actually two kinds of pounds: pounds-force (lbf) and pounds-mass (lbm). So if George's tractor weighs 2000 pounds, it has a MASS of 2000 pounds-mass, and an it exerts a force of 2000 pounds-force on the earth. If we shoot it up to the moon, it will still have a mass of 2000 lbm, but it will only push into the moondust with a force of about 300 lbf. On earth or the moon, it takes 2000 lbf to accelerate the beast laterally at one earth G.
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