Kepler problem : the two-body problem in celestial dynamics
Circular restricted 3-body problem : circular restricted 3-body problem in celestial dynamics
Lorenz attractor : system of ODE notable for having chaotic solutions for certain parameter values and initial conditions
Van der Pohl oscillator : model of a generator on a triode for a tube with a cubic characteristic
Mathematical pendulum : the simple physical system that allows analytic solution
Pendulum on tube : not so simple physical system similar to the mathematical pendulum
Double pendulum : the simple physical system that exhibits rich dynamic behavior with a strong sensitivity to initial conditions