## SI fundamental units

In 1960, an international committee established a set of standards for the fundamental quantities of science. It is called the SI (Système International) fundamental units. The three fundamental physical quantities of mechanics are length, mass, and time, which in the SI system have the units meter (m), kilogram (kg), and second (s), respectively. These fundamental quantities cannot be defined in terms of more basic quantities.
 Meaning SI Units Basic SI Units Length m m Mass kg kg Time s s Speed m//s m//s Force N kg•m//s^2