A basic pendulum is a mass at the end of a string that swings back and forth. It seems simple, and it appears in most introductory physics textbooks. But it's not a trivial problem to solve for the ...

The Foucault Pendulum illustrates the rotation of the earth. It is not constrained to stay in a fixed plane like a clock pendulum, but instead its ordinary pendulum motion is free to change direction ...

Can a pendulum swing in space? It might if it is quantum powered – a fact that could be exploited to build tiny timepieces that exploit an unusual force that occurs on the smallest scale in a vacuum.