Central Force A Nexus mindmap 0 0 0 1 0 0 1 0 1 2 3 Lagrangian 1 0 1 0 2 0 0 0 1 0 1 2 1 Euler-Lagrange equations 2 0 0 0 A conserved quantity 0 0 1 1 2 0 0 1 1 0 1 2 3 3 4 Cyclic coordinates 1 Central Force