The Lagrange Function is a function that summarizes the dynamics of the system.
$L(q_i, \dot{q_i}) = T(q_i, \dot{q_i}) - V(q_i)$, where $T$ is kinetic energy, $V$ is potential energy, $q_i$ is a generalized coordinate, and $\dot{q_i}$ is a generalized velocity.
Applicable units are those of quantitykind:LagrangeFunction
Lagrange Function