foucault pendulum
Học thuậtThân thiện
Definition
Noun: A Foucault pendulum is a scientific apparatus consisting of a heavy weight suspended from a very long, free-swinging wire. Its key characteristic is that it can swing in any horizontal direction. The gradual, predictable change in the plane of its swing provides a simple, visible demonstration of the Earth's rotation on its axis.
Usage
The term is used specifically to refer to this type of pendulum and the phenomenon it demonstrates. * The museum's main hall features a large Foucault pendulum that slowly knocks over a circle of pegs throughout the day. * To prove the Earth rotates, you can observe a Foucault pendulum. * The experiment with the Foucault pendulum was first successfully conducted by Léon Foucault in 1851.
Advanced Usage
- The phrase is often used in educational and scientific contexts to illustrate principles of physics and astronomy.
- It can be used metaphorically to describe something that provides clear, undeniable proof of a fundamental truth or change.
- The sudden market crash was a Foucault pendulum for the flaws in the economic system.
Variants and Related Words
- Pendulum (n): A weight suspended from a pivot so that it can swing freely. A Foucault pendulum is a specific type of pendulum.
- Foucault's pendulum: An alternative possessive form with the same meaning.
Synonyms
- Demonstration pendulum (context-specific)
- Earth-rotation pendulum (descriptive)
Related Phrases and Concepts
- Coriolis effect: The apparent deflection of moving objects when viewed from a rotating frame of reference, which is the physical principle demonstrated by the Foucault pendulum.
- Plane of swing: The direction in which the pendulum bob moves back and forth. The rotation of this plane is what is observed.
- Precession: In physics, a change in the orientation of the rotational axis of a rotating body. The Foucault pendulum exhibits a form of precession caused by the Earth's rotation.
Noun
- pendulum with a long wire; can swing in any direction; the change in the swing plane demonstrates the earth's rotation