A [[Quadrature|Numerical Integration]] method typically used to solve [[Differential Equations]]. $\huge \begin{align} y_{n+{1}} &= y_{n} + \Delta t v_{n} \\ v_{n+1} &= v_{n }+ \Delta t { a_{n+1}} \end{align} $ This method works when the acceleration $a_{n}$ is a function only of $y$.