# kinematics

kinematics
/kin'euh mat"iks, kuy'neuh-/, n. (used with a sing. v.) Physics.
1. the branch of mechanics that deals with pure motion, without reference to the masses or forces involved in it.
2. Also called applied kinematics. the theory of mechanical contrivance for converting one kind of motion into another.
[1830-40; < Gk kinemat- (s. of kínema movement; see CINEMA) + -ICS]

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Branch of physics concerned with the geometrically possible motion of a body or system of bodies, without consideration of the forces involved.

It describes the spatial position of bodies or systems, their velocities, and their acceleration. See also dynamics.

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branch of physics and a subdivision of classical mechanics concerned with the geometrically possible motion of a body or system of bodies without consideration of the forces involved (i.e., causes and effects of the motions).

Kinematics aims to provide a description of the spatial position of bodies or systems of material particles, the rate at which the particles are moving ( velocity), and the rate at which their velocity is changing ( acceleration). When the causative forces are disregarded, motion descriptions are possible only for particles having constrained motion—i.e., moving on determinate paths. In unconstrained, or free, motion, the forces determine the shape of the path.

For a particle moving on a straight path, a list of positions and corresponding times would constitute a suitable scheme for describing the motion of the particle. A continuous description would require a mathematical formula expressing position in terms of time.

When a particle moves on a curved path, a description of its position becomes more complicated and requires two or three dimensions. In such cases continuous descriptions in the form of a single graph or mathematical formula are not feasible. The position of a particle moving on a circle, for example, can be described by a rotating radius of the circle, like the spoke of a wheel with one end fixed at the centre of the circle and the other end attached to the particle. The rotating radius is known as a position vector for the particle, and, if the angle between it and a fixed radius is known as a function of time, the magnitude of the velocity and acceleration of the particle can be calculated. Velocity and acceleration, however, have direction as well as magnitude; velocity is always tangent to the path, while acceleration has two components, one tangent to the path and the other perpendicular to the tangent.

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Universalium. 2010.

### См. также в других словарях:

• Kinematics — Kin e*mat ics, n. [Gr. (?),(?) motion, fr. kinei^n to move.] (Physics) The science which treats of motions considered in themselves, or apart from their causes; the comparison and relation of motions. [1913 Webster] Note: Kinematics forms… …   The Collaborative International Dictionary of English

• kinematics — (n.) science of motion, 1840, from Fr. cinématique (Ampère, 1834), from Gk. kinesis movement, motion (see CITE (Cf. cite)). Related: Kinematic (1864); kinematical …   Etymology dictionary

• kinematics — ► PLURAL NOUN (treated as sing. ) ▪ the branch of mechanics concerned with the motion of objects without reference to the forces which cause the motion. DERIVATIVES kinematic adjective. ORIGIN from Greek kin ma motion …   English terms dictionary

• kinematics — [kin΄ə mat′iks] n. [Fr cinématique < Gr kinēma (gen. kinēmatos), motion < kinein, to move (see CITE) + ICS] the branch of mechanics that deals with motion in the abstract, without reference to the force or mass kinematic adj. kinematical …   English World dictionary

• Kinematics — Classical mechanics Newton s Second Law History of classical mechanics  …   Wikipedia

• kinematics — In physiology, the science concerned with movements of the parts of the body. SYN: cinematics. [G. kinematica, things that move] * * * ki·ne·mat·ics .kin ə mat iks, .kī nə also ci·ne·mat·ics .sin ə n pl but sing in constr 1) a branch of physics… …   Medical dictionary

• kinematics — kinematika statusas T sritis fizika atitikmenys: angl. kinematics vok. Kinematik, f rus. кинематика, f pranc. cinématique, f …   Fizikos terminų žodynas

• kinematics — kinematika statusas T sritis Kūno kultūra ir sportas apibrėžtis Klasikinės mechanikos mokslo šaka, tirianti kūnų judėjimą geometriniu požiūriu. kilmė gr. kinēma – judėjimas atitikmenys: angl. kinematics vok. Kinematik, f rus. кинематика …   Sporto terminų žodynas

• kinematics — noun plural but singular in construction Etymology: French cinématique, from Greek kinēmat , kinēma motion, from kinein to move Date: 1840 a branch of dynamics that deals with aspects of motion apart from considerations of mass and force •… …   New Collegiate Dictionary

• kinematics — noun The branch of mechanics concerned with objects in motion, but not with the forces involved. See Also: kinematic …   Wiktionary

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