Pendulum
From The Art and Popular Culture Encyclopedia
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| + | "To escape the gnawing emptiness of existence some resistance is needed, and its backbone is language. Even the strongest animal is infinitely feeble. Schopenhauer's doctrine according to which the [[pendulum]] of life oscillates between pain and boredom, between brief moments of sated impulse and endless craving, is true of the animal, which cannot interrupt the fatal cycle with cognition."--''[[Dialectic of Enlightenment ]]'' | ||
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| - | # A [[body]] [[suspend]]ed from a [[fix]]ed [[support]] so that it [[swing]]s [[free]]ly [[back]] and [[forth]] under the [[influence]] of [[gravity]], commonly used to [[regulate]] various [[device]]s such as [[clock]]s. | + | |
| + | A '''pendulum''' is a weight suspended from a [[pivot|pivot]] so that it can swing freely. When a pendulum is displaced sideways from its resting [[Mechanical equilibrium|equilibrium position]], it is subject to a [[restoring force]] due to [[gravity]] that will accelerate it back toward the equilibrium position. When released, the restoring force combined with the pendulum's mass causes it to [[oscillate]] about the equilibrium position, swinging back and forth. The time for one complete cycle, a left swing and a right swing, is called the [[Frequency|period]]. A pendulum swings with a specific period which depends (mainly) on its length. | ||
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| + | From its discovery around 1602 by [[Galileo Galilei]] the regular motion of pendulums was used for timekeeping, and was the world's most accurate timekeeping technology until the 1930s. Pendulums are used to regulate [[pendulum clock]]s, and are used in scientific instruments such as [[accelerometer]]s and [[seismometer]]s. Historically they were used as [[gravimeter]]s to measure the [[acceleration of gravity]] in geophysical surveys, and even as a standard of length. The word 'pendulum' is [[new Latin]], from the Latin ''pendulus'', meaning 'hanging'. | ||
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| + | ==See also== | ||
| + | <div style="-moz-column-count:4; column-count:4;"> | ||
| + | * [[Barton's Pendulums]] | ||
| + | * [[Blackburn pendulum]] | ||
| + | * [[Conical pendulum]] | ||
| + | * [[Doubochinski's pendulum]] | ||
| + | * [[Double pendulum]] | ||
| + | * [[Double inverted pendulum]] | ||
| + | * [[Foucault pendulum]] | ||
| + | * [[Furuta pendulum]] | ||
| + | * [[Gridiron pendulum]] | ||
| + | * [[Inertia wheel pendulum]] | ||
| + | * [[Inverted pendulum]] | ||
| + | * [[Harmonograph]] (a.k.a. "Lissajous pendulum") | ||
| + | * [[Kapitza's pendulum]] | ||
| + | * [[Kater's pendulum]] | ||
| + | * [[Metronome]] | ||
| + | * [[Pendulum (mathematics)]] | ||
| + | * [[Pendulum clock]] | ||
| + | * [[Pendulum rocket fallacy]] | ||
| + | * [[Seconds pendulum]] | ||
| + | * [[Simple harmonic motion]] | ||
| + | * [[Spherical pendulum]] | ||
| + | * [[Torsional pendulum]] | ||
| + | </div> | ||
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Current revision
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"To escape the gnawing emptiness of existence some resistance is needed, and its backbone is language. Even the strongest animal is infinitely feeble. Schopenhauer's doctrine according to which the pendulum of life oscillates between pain and boredom, between brief moments of sated impulse and endless craving, is true of the animal, which cannot interrupt the fatal cycle with cognition."--Dialectic of Enlightenment |
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A pendulum is a weight suspended from a pivot so that it can swing freely. When a pendulum is displaced sideways from its resting equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position. When released, the restoring force combined with the pendulum's mass causes it to oscillate about the equilibrium position, swinging back and forth. The time for one complete cycle, a left swing and a right swing, is called the period. A pendulum swings with a specific period which depends (mainly) on its length.
From its discovery around 1602 by Galileo Galilei the regular motion of pendulums was used for timekeeping, and was the world's most accurate timekeeping technology until the 1930s. Pendulums are used to regulate pendulum clocks, and are used in scientific instruments such as accelerometers and seismometers. Historically they were used as gravimeters to measure the acceleration of gravity in geophysical surveys, and even as a standard of length. The word 'pendulum' is new Latin, from the Latin pendulus, meaning 'hanging'.
See also
- Barton's Pendulums
- Blackburn pendulum
- Conical pendulum
- Doubochinski's pendulum
- Double pendulum
- Double inverted pendulum
- Foucault pendulum
- Furuta pendulum
- Gridiron pendulum
- Inertia wheel pendulum
- Inverted pendulum
- Harmonograph (a.k.a. "Lissajous pendulum")
- Kapitza's pendulum
- Kater's pendulum
- Metronome
- Pendulum (mathematics)
- Pendulum clock
- Pendulum rocket fallacy
- Seconds pendulum
- Simple harmonic motion
- Spherical pendulum
- Torsional pendulum
