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Τι (ποιος) είναι Pendulum - ορισμός
![Replica of [[Zhang Heng]]'s [[seismometer]]. The pendulum is contained inside.](https://commons.wikimedia.org/wiki/Special:FilePath/EastHanSeismograph.JPG?width=200 "Replica of [[Zhang Heng]]'s [[seismometer]]. The pendulum is contained inside.")
![The [[Foucault pendulum]] in 1851 was the first demonstration of the Earth's rotation that did not involve celestial observations, and it created a "pendulum mania". In this animation the rate of precession is greatly exaggerated.](https://commons.wikimedia.org/wiki/Special:FilePath/Foucault pendulum animated.gif?width=200 "The [[Foucault pendulum]] in 1851 was the first demonstration of the Earth's rotation that did not involve celestial observations, and it created a \"pendulum mania\". In this animation the rate of precession is greatly exaggerated.")
.jpg?width=200 "Repetition of Huygens experiment showing synchronization of two clocks")
![Shortt-Synchronome free pendulum clock]], the most accurate pendulum clock ever made, at the [[NIST]] museum, [[Gaithersburg, MD]], USA. It kept time with two synchronized pendulums. The master pendulum in the vacuum tank ''(left)'' swung free of virtually any disturbance, and controlled the slave pendulum in the clock case ''(right)'' which performed the impulsing and timekeeping tasks. Its accuracy was about a second per year.](https://commons.wikimedia.org/wiki/Special:FilePath/Shortt Synchronome free pendulum clock.jpg?width=200 "Shortt-Synchronome free pendulum clock]], the most accurate pendulum clock ever made, at the [[NIST]] museum, [[Gaithersburg, MD]], USA. It kept time with two synchronized pendulums. The master pendulum in the vacuum tank ''(left)'' swung free of virtually any disturbance, and controlled the slave pendulum in the clock case ''(right)'' which performed the impulsing and timekeeping tasks. Its accuracy was about a second per year.")
Βικιπαίδεια
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 acting on 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. The period depends on the length of the pendulum and also to a slight degree on the amplitude, the width of the pendulum's swing.
The regular motion of pendulums was used for timekeeping and was the world's most accurate timekeeping technology until the 1930s. The pendulum clock invented by Christiaan Huygens in 1656 became the world's standard timekeeper, used in homes and offices for 270 years, and achieved accuracy of about one second per year before it was superseded as a time standard by the quartz clock in the 1930s. Pendulums are also used in scientific instruments such as accelerometers and seismometers. Historically they were used as gravimeters to measure the acceleration of gravity in geo-physical surveys, and even as a standard of length. The word pendulum is new Latin, from the Latin pendulus, meaning hanging.
