The force law is therefore F = − − m h 2 u 2 ( − − ε ε cos ⁡ ⁡ θ θ l + 1 + ε ε cos ⁡ ⁡ θ θ l ) = − − m h 2 u 2 l = − − m h 2 l r 2 , which is the anticipated inverse square law. Matching the orbital h 2 / l = μ μ to physical values like G M or k e q 1 q 2 / m reproduces Newton's law of universal gravitation or Coulomb's law, respectively.