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# Pendulums - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about ' Pendulums ' - esben

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Presentation Transcript

### Pendulums

By:

Nahdir Austin

Honors Physics

Period 2

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.

• 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.

• 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.