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Pendulums . By: Nahdir Austin Honors Physics Period 2 . History of the Pendelum. First used in the H an dynasty’s seismometer device by scientists Zhang Heng . T enth century Egyptian astronomer Ibn Yunis used a pendulum for time measurement.

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Pendulums

Pendulums

By:

Nahdir Austin

Honors Physics

Period 2


History of the pendelum
History of the Pendelum

  • First used in the Han dynasty’s seismometer device by scientists Zhang Heng.

  • Tenth century Egyptian astronomer Ibn Yunis used a pendulum for time measurement.

  • Leonardo da Vinci made many drawings of the motion of pendulums.

  • Italian scientist Galileo Galilei was the first to study the properties of pendulums, beginning around 1602.

  • Most accurate time keeping device up until the 1930’s, when the quartz was invented.


Period of oscillation
Period of oscillation

  • A pendulum is a weight suspended from its pivot so it can move freely.

  • When released the restoring force combined with the pendulum's mass causes it to oscillate about the equilibrium position, swinging back and forth

  • Period: Time for one complete cycle, a left and right swing.

  • Swing periods of a simple gravity pendulum is dependent on its length, acceleration of gravity, and its amplitude.

  • The property of isochronisms is the reason why pendulums are good for timekeeping.

    • Isochronisms: regardless of the amplitude of oscillation the period of pendulums of equal length is constant.

  • They are directly effected by the acceleration of gravity, which is constant.

    • Since the force of gravity slightly differs throughout the earth, pendulums need to be adjusted when moved to a new area.


Uses of the pendulum
Uses of the Pendulum

  • Used as a gravimeter to measure local gravity.

  • Used in seismometers, which measures earth’s tremors.

  • They are an important factor for Schuler tuning, which is used in guidance systems of planes and ships

  • Some religions use pendulum motion at religious ceremonies such as The swinging incense burner called a censer.