# periodic motion

periodic motion
/pear"ee od"ik, pear'-/, Physics.
any motion that recurs in identical forms at equal intervals of time.

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Motion that is repeated in equal intervals of time.

The time of each interval is the period. Examples of periodic motion include a rocking chair, a bouncing ball, a vibrating guitar string, a swinging pendulum, and a water wave. See also simple harmonic motion.

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in physics, motion repeated in equal intervals of time. Periodic motion is performed, for example, by a rocking chair, a bouncing ball, a vibrating tuning fork, a swing in motion, the Earth in its orbit around the Sun, and a water wave (wave motion). In each case the interval of time for a repetition, or cycle, of the motion is called a period, while the number of periods per unit time is called the frequency. Thus, the period of the Earth's orbit is one year, and its frequency is one orbit per year. A tuning fork might have a frequency of 1,000 cycles per second and a period of 1 millisecond (1 thousandth of a second).

simple harmonic motion is a special case of periodic motion. In the examples given above, the rocking chair, the tuning fork, the swing, and the water wave execute simple harmonic motion, but the bouncing ball and the Earth in its orbit do not.

Waves that can be represented by sine curves are periodic. If the wave is propagated with a velocity v and has a wavelength λ, then the period T is equal to wavelength divided by velocity, or T= λ/v. The frequency f is the reciprocal of the period; thus, f = 1/T = v/λ.

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Universalium. 2010.

### См. также в других словарях:

• periodic motion — periodinis judėjimas statusas T sritis fizika atitikmenys: angl. periodic motion vok. periodische Bewegung, f rus. периодическое движение, n pranc. mouvement périodique, m …   Fizikos terminų žodynas

• periodic motion — noun motion that recurs over and over and the period of time required for each recurrence remains the same • Syn: ↑periodic movement • Hypernyms: ↑movement, ↑motion • Hyponyms: ↑harmonic motion * * * noun …   Useful english dictionary

• periodic — [pir΄ē äd′ik] adj. [MFr periodique < L periodicus < Gr periodikos] 1. occurring, appearing, or recurring at regular intervals [a periodic fever] 2. occurring from time to time; intermittent 3. of or characterized by periods [the periodic… …   English World dictionary

• Periodic function — Not to be confused with periodic mapping, a mapping whose nth iterate is the identity (see periodic point). In mathematics, a periodic function is a function that repeats its values in regular intervals or periods. The most important examples are …   Wikipedia

• motion — motional, adj. motioner, n. /moh sheuhn/, n. 1. the action or process of moving or of changing place or position; movement. 2. power of movement, as of a living body. 3. the manner of moving the body in walking; gait. 4. a bodily movement or… …   Universalium

• periodic movement — noun motion that recurs over and over and the period of time required for each recurrence remains the same • Syn: ↑periodic motion • Hypernyms: ↑movement, ↑motion • Hyponyms: ↑harmonic motion …   Useful english dictionary

• periodic — adj. 1 appearing or occurring at regular intervals. 2 of or concerning the period of a celestial body (periodic motion). 3 (of diction etc.) expressed in periods (see PERIOD n. 7a). Phrases and idioms: periodic decimal Math. a set of figures… …   Useful english dictionary

• Periodic — Pe ri*od ic, Periodical Pe ri*od ic*al, a. [L. periodicus, Gr. ?: cf. F. p[ e]riodique.] 1. Of or pertaining to a period or periods, or to division by periods. [1913 Webster] The periodicaltimes of all the satellites. Sir J. Herschel. [1913… …   The Collaborative International Dictionary of English

• Periodic comet — Periodic Pe ri*od ic, Periodical Pe ri*od ic*al, a. [L. periodicus, Gr. ?: cf. F. p[ e]riodique.] 1. Of or pertaining to a period or periods, or to division by periods. [1913 Webster] The periodicaltimes of all the satellites. Sir J. Herschel.… …   The Collaborative International Dictionary of English

• Periodic function — Periodic Pe ri*od ic, Periodical Pe ri*od ic*al, a. [L. periodicus, Gr. ?: cf. F. p[ e]riodique.] 1. Of or pertaining to a period or periods, or to division by periods. [1913 Webster] The periodicaltimes of all the satellites. Sir J. Herschel.… …   The Collaborative International Dictionary of English

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