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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 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.

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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 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. From the first scientific investigations of the pendulum 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. The pendulum clock invented by Christiaan Huygens in 1658 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timekeeper, used in homes and offices for 270 years, and achieved accuracy of about one second per year before it was superseded as a time standard by the quartz clock in the 1930s.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'. (en)
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dbp:align
• center (en)
• left (en)
• right (en)
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• dbr:Gridiron_pendulum
• Mercury pendulum (en)
• Ellicott pendulum, another temperature compensated type (en)
• Animation of a pendulum showing the velocity and acceleration vectors. (en)
• Longcase clock pendulum (en)
• Ornamented pendulum in a French Comtoise clock (en)
• Animation of a pendulum showing forces acting on the bob: the tension T in the rod and the gravitational force mg. (en)
• Animation of anchor escapement, one of the most widely used escapements in pendulum clocks (en)
• Invar pendulum in low pressure tank in Riefler regulator clock, used as the US time standard from 1909 to 1929 (en)
• Pendulum and anchor escapement from a grandfather clock (en)
dbp:date
• September 2019 (en)
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• horizontal (en)
• vertical (en)
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• The first pendulum clock (en)
• The period of a pendulum gets longer as the amplitude θ0 increases. (en)
• Pendulum (en)
• Clock pendulums (en)
• center (en)
dbp:image
• Huygens first pendulum clock - front view.png (en)
• Huygens first pendulum clock.png (en)
• Anchor escapement animation 217x328px.gif (en)
• Ellicott pendulum.png (en)
• Gaine Comtoise.jpg (en)
• Grandfather clock pendulum.png (en)
• Mercury pendulum.png (en)
• Oscillating pendulum.gif (en)
• PenduloTmg.gif (en)
• Pendulum 120deg.gif (en)
• Pendulum 170deg.gif (en)
• Pendulum 30deg.gif (en)
• Pendulum 60deg.gif (en)
• Pendulum-with-Escapement.png (en)
• Riefler clock NIST.jpg (en)
• Tidens naturlære fig22.png (en)
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• what is meant by "used" in this context? (en)
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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 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. (en)
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• Pendulum (en)
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