What does a Foucault pendulum demonstrate? – 2017

What does a Foucault pendulum demonstrate?

Correct answer

The Earth’s rotation

86% got this right

First demonstrated in public by the device’s inventor, the pendulum swings by degrees as the Earth rotates on its axis. This Dartmouth professor does a better job of explaining it.

Foucault pendulum
The Foucault pendulum, or Foucault’s pendulum, named after the French physicist Léon Foucault, is a simple device conceived as an experiment to demonstrate the rotation of the Earth. While it had long been known that the Earth rotates, the introduction of the Foucault pendulum in 1851 was the first simple proof of the rotation in an easy-to-see experiment.

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