5c: Torsional Waves

A third type of wave is a torsional or twisting wave. If you stretch a slinky out between two points and gently twist it at one end, the twist will travel down the slinky as a wave pulse. This is an example of a torsional wave. We saw two YouTube examples of bridges undergoing torsional motion in the last chapter: twisting bridgeTacoma Narrows. These were examples of standing torsional waves.

Video/audio examples:

Longitudinal and transverse waves on a slinky.

Animations of different wave types.

Torsion pendulum.

Transverse, longitudinal and torsional waves.

Wilberforce Pendulum which converts up and down motion to twisting motion and back.

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