Simulate and Animate a Foucault Pendulum at the North Pole A Foucault pendulum demonstrates the rotation of the Earth. The pendulum has a long cord and swings in a Newtonian ' R ) frame since it is mounted on a Foucault Pendulum, Position of Q frictionless hinge. * e, But since we are observing in the Earth (non-Newtonian) frame, we can see the effect of the Earth's N i rotation in the ground track 5w e e e of the pendulum. ey position (m)