The undamped system will then vibrate at its natural frequency. The textbook example of a periodic motion is the undamped pendulum. An undamped car will oscillate up and down. The angular position of an undamped pendulum is a continuous (and therefore infinite) state space. The glass-fibre shell was a monocoque with coil-sprung, undamped wheels. Attached to the gearbox was the swinging arm, with an undamped shock absorber each side. This permitted the production of undamped continuous waves with high power. The number "f" is called the undamped natural frequency. The front fork is a central undamped spring. He also made the ""Oscillion"", an undamped wave transmitter. With the switches at these settings, the movement is completely undamped.