The International System of Units(SI) is widely used for trade, science, and engineering the unit of force is the newton, symbol N. The base units relevant to force are "The meter, unit of length (Symbol m), "The kilogram, unit of mass" (Symbol kg)", The second, unit of time (Symbol s)". Force is defined as the rate of change of momentum. For an unchanging mass, this is equivalent to mass x acceleration. So, 1 N =1 kg m s-2 or 1 kg m/s2.