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| Topic 2 Lesson 2
Units and dimensions, systems of units, dimensional homogeneity Force and Newton's Laws Force, Mass, and Weight 
Newton's Second Law, SI Units 
A force of one Newton applied to a mass of one kilogram results in
an acceleration of one meter per second squared.
1 N = 1 kg m / s2
Therefore, the proportionality constant is unity for the SI system
of units.
Newton's Second Law, American Engineering Units A force of one pound-force applied to a mass of one pound-mass results in an acceleration of 32.174 feet per second squared. 1 lbf = 32.174 lbm ft / s2
Therefore, the proportionality constant is not unity for the American
Engineering system of units.
Newton's Second Law, Generalized for all Systems of Units Force = Mass x Acceleration / gc F = ma/gc
gc is best viewed as a conversion factor between two derived
units of force:
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