Force in the SI and the American Engr. Systems
Note: Weight is a force, therefore:
In the American Engineering System, force is considered a fundamental dimension and the unit for it is the pound-force (lbf).
1 lbm exerts 1 lbf under the average gravitational acceleration of 32.174 ft/s2.
gc is the
Standard Gravitational Constant
Always write the subscripts on lbm and lbf !
In the SI System
, force is not
a fundamental dimension
. The units of force are Newtons
and 1 kg
exerts 1 N
of force under an acceleration of 1 m/s
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