motion Idioms & Phrases


academy of motion picture arts and sciences

  • noun an academy that gives annual awards for achievements in motion picture production and performance
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Accelerated motion

  • (Mech.), motion with a continually increasing velocity.
Webster 1913

Angular motion

  • the motion of a body about a fixed point or fixed axis, as of a planet or pendulum. It is equal to the angle passed over at the point or axis by a line drawn to the body.
Webster 1913

Apex of the earth's motion

  • (Astron.), that point of the heavens toward which the earth is moving in its orbit.
Webster 1913

apparent motion

  • noun an optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object
    motion; apparent movement; movement.
    • the cinema relies on apparent motion
    • the succession of flashing lights gave an illusion of movement
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axial motion

  • noun rotary motion of an object around its own axis
    axial rotation; roll.
    • wheels in axial rotation
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brownian motion

  • noun the random motion of small particles suspended in a gas or liquid
    pedesis; Brownian movement.
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Center of motion

  • the point which remains at rest, while all the other parts of a body move round it.
Webster 1913

Center of motion, Harmonic motion

  • etc. See under Center, Harmonic, etc.
Webster 1913

Compound motion

  • . See Motion.
Webster 1913

Contrary motion

  • (Mus.), the progression of parts in opposite directions, one ascending, the other descending.
Webster 1913

Differential motion

  • a mechanism in which a simple differential combination produces such a change of motion or force as would, with ordinary compound arrangements, require a considerable train of parts. It is used for overcoming great resistance or producing very slow or very rapid motion.
Webster 1913

Diurnal motion of a heavenly body

  • that apparent motion of the heavenly body which is due to the earth's diurnal motion.
Webster 1913

Diurnal motion of the earth

  • the motion of the earth upon its axis which is described in twentyfour hours.
Webster 1913

electro-motion

E*lec`tro-mo"tion noun

Definitions
  1. The motion of electricity or its passage from one metal to another in a voltaic circuit; mechanical action produced by means of electricity.
Webster 1913

excito-motion

Ex*ci`to-mo"tion noun

Definitions
  1. (Physiol.) Motion excited by reflex nerves. See Excito-motory.
Webster 1913

Feed motion, ∨ Feed gear

  • (Mach.), the train of mechanism that gives motion to the part that directly produces the feed in a machine.
Webster 1913

first law of motion

  • noun a body remains at rest or in motion with a constant velocity unless acted upon by an external force
    first law of motion; Newton's first law.
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forward motion

  • noun the act of moving forward (as toward a goal)
    advance; forward motion; progression; advancement; procession; progress.
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go through the motions

  • verb pretend to do something by acting as if one was really doing it
    • She isn't really working--she's just going through the motions
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Harmonic motion

  • noun a periodic motion in which the displacement is either symmetrical about a point or is the sum of such motions
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  • the motion of the point A, of the foot of the perpendicular PA, when P moves uniformly in the circumference of a circle, and PA is drawn perpendicularly upon a fixed diameter of the circle. This is simple harmonic motion. The combinations, in any way, of two more simple harmonic motions, make other kinds of harmonic motion. The motion of the pendulum bob of a clock is approximately simple harmonic motion.
Webster 1913

Hook motion

  • (Steam Engin.), a valve gear which is reversed by V hooks.
Webster 1913

ideo-motion

I`de*o-mo"tion noun

Definitions
  1. (Physiol.) An ideo-motor movement.
Webster 1913

kepler's law of planetary motion

  • noun (astronomy) one of three empirical laws of planetary motion stated by Johannes Kepler
    Kepler's law.
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law of motion

  • noun one of three basic laws of classical mechanics
    law of motion; Newton's law.
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Laws of motion

  • (Physics), three laws defined by Sir Isaac Newton: (1) Every body perseveres in its state of rest or of moving uniformly in a straight line, except so far as it is made to change that state by external force. (2) Change of motion is proportional to the impressed force, and takes place in the direction in which the force is impressed. (3) Reaction is always equal and opposite to action, that is to say, the actions of two bodies upon each other are always equal and in opposite directions.
Webster 1913

Link" mo"tion

Definitions
  1. (Steam Engine) A valve gear, consisting of two eccentrics with their rods, giving motion to a slide valve by an adjustable connecting bar, called the link, in such a way that the motion of the engine can be reversed, or the cut-off varied, at will; -- used very generally in locomotives and marine engines. ✍ The illustration shows a link motion for a vertical engine, c representing the shaft carrying two eccentrics, a and b, for making the engine run forward and backward, respectively, their rods e and d being jointed to opposite ends of the slotted link f, in the opening of which is a pin g which is attached to the valve rod h. The valve will receive the motion of the forward eccentric when is in the position shown, and the motion of the backward eccentric when the link is shifted so far to the right as to bring e in line with h, or a compound motion derived from both eccentrics when the link is shifted to intermediate positions, the compound motion causing the valve to cut off the steam at a point determined by the position to which the link may have been shifted.
Webster 1913

Lost motion

  • (Mach.), the difference between the motion of a driver and that of a follower, due to the yielding of parts or looseness of joints.
Webster 1913

make a motion

  • verb propose formally; in a debate or parliamentary meeting
    move.
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Motion block

  • (Steam Engine), a crosshead.
Webster 1913

motion picture

  • noun a form of entertainment that enacts a story by sound and a sequence of images giving the illusion of continuous movement
    flick; picture; picture show; pic; movie; motion picture; moving-picture show; film; moving picture.
    • they went to a movie every Saturday night
    • the film was shot on location
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motion sickness

  • noun the state of being dizzy or nauseated because of the motions that occur while traveling in or on a moving vehicle
    kinetosis.
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motion study

  • noun an analysis of a specific job in an effort to find the most efficient method in terms of time and effort
    time and motion study; work study; motion study; time study; time-and-motion study.
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motion-picture camera

  • noun a camera that takes a sequence of photographs that can give the illusion of motion when viewed in rapid succession
    movie camera; cine-camera.
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motion-picture fan

  • noun someone who goes to see movies
    moviegoer.
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motion-picture film

  • noun photographic film several hundred feet long and wound on a spool; to be used in a movie camera
    cine-film; movie film.
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motion-picture photography

  • noun the act of making a film
    filming; cinematography.
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motion-picture show

  • noun a form of entertainment that enacts a story by sound and a sequence of images giving the illusion of continuous movement
    flick; picture; picture show; pic; movie; motion picture; moving-picture show; film; moving picture.
    • they went to a movie every Saturday night
    • the film was shot on location
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newton's first law of motion

  • noun a body remains at rest or in motion with a constant velocity unless acted upon by an external force
    first law of motion; Newton's first law.
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newton's law of motion

  • noun one of three basic laws of classical mechanics
    law of motion; Newton's law.
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newton's second law of motion

  • noun the rate of change of momentum is proportional to the imposed force and goes in the direction of the force
    Newton's second law; Newton's second law of motion.
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newton's third law of motion

  • noun action and reaction are equal and opposite
    Newton's third law of motion; Newton's third law; law of action and reaction.
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Oblique motion

  • (Mus.), a kind of motion or progression in which one part ascends or descends, while the other prolongs or repeats the same tone, as in the accompanying example.
Webster 1913

onward motion

  • noun the act of moving forward (as toward a goal)
    advance; forward motion; progression; advancement; procession; progress.
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orbital motion

  • noun motion of an object in an orbit around a fixed point
    orbital rotation.
    • satellites in orbital rotation
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Parallel motion

  • . (a) (Mach.) A jointed system of links, rods, or bars, by which the motion of a reciprocating piece, as a piston rod, may be guided, either approximately or exactly in a straight line . Rankine. (b) (Mus.) The ascending or descending of two or more parts at fixed intervals, as thirds or sixths.
Webster 1913

periodic motion

  • noun motion that recurs over and over and the period of time required for each recurrence remains the same
    periodic movement.
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Perpetual motion

  • noun motion that continues indefinitely without any external source of energy; impossible in practice because of friction
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  • (Mech.), an incessant motion conceived to be attainable by a machine supplying its own motive forces independently of any action from without.
Webster 1913

perpetual motion machine

  • noun a machine that can continue to do work indefinitely without drawing energy from some external source; impossible under the law of conservation of energy
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Positive motion

  • (Mach.), motion which is derived from a driver through unyielding intermediate pieces, or by direct contact, and not through elastic connections, nor by means of friction, gravity, etc.; definite motion.
Webster 1913

Quantity of motion

  • (Mech.), in a body, the relative amount of its motion, as measured by its momentum, varying as the product of mass and velocity.
Webster 1913

Reciprocating motion

  • (Mech.), motion alternately backward and forward, or up and down, as of a piston rod.
Webster 1913

Resolution of a forcemotion

  • (Mech.), the separation of a single force or motion into two or more which have different directions, and, taken together, are an equivalent for the single one; the opposite of composition of a force.
Webster 1913

Resultant forcemotion

  • (Mech.), a force which is the result of two or more forces acting conjointly, or a motion which is the result of two or more motions combined. See Composition of forces, under Composition.
Webster 1913

rotary motion

  • noun the act of rotating as if on an axis
    rotation.
    • the rotation of the dancer kept time with the music
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second law of motion

  • noun the rate of change of momentum is proportional to the imposed force and goes in the direction of the force
    Newton's second law; Newton's second law of motion.
WordNet

self-motion

Self`-mo"tion noun

Definitions
  1. Motion given by inherent power, without external impulse; spontaneus or voluntary motion.
    Matter is not induced with self-motion. Cheyne.
Webster 1913

set in motion

  • verb get going; give impetus to
    launch.
    • launch a career
    • Her actions set in motion a complicated judicial process
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simple harmonic motion

  • noun periodic motion in which the restoring force is proportional to the displacement
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slow motion

  • noun a movie that apparently takes place at a slower than normal speed; achieved by taking the film at a faster rate
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Stop motion

  • (Mach.), an automatic device for arresting the motion of a machine, as when a certain operation is completed, or when an imperfection occurs in its performance or product, or in the material which is supplied to it, etc.
Webster 1913

Tappet motion

  • a valve motion worked by tappets from a reciprocating part, without an eccentric or cam, used in steam pumps, etc.
Webster 1913

third law of motion

  • noun action and reaction are equal and opposite
    Newton's third law of motion; Newton's third law; law of action and reaction.
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time and motion study

  • noun an analysis of a specific job in an effort to find the most efficient method in terms of time and effort
    time and motion study; work study; motion study; time study; time-and-motion study.
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time-and-motion study

  • noun an analysis of a specific job in an effort to find the most efficient method in terms of time and effort
    time and motion study; work study; motion study; time study; time-and-motion study.
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time-motion study

  • noun an analysis of a specific job in an effort to find the most efficient method in terms of time and effort
    time and motion study; work study; motion study; time study; time-and-motion study.
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Uniform motion

  • the motion of a body when it passes over equal spaces in equal times; equable motion.
Webster 1913

Valve gear, ∨ Valve motion

  • (Steam Engine), the system of parts by which motion is given to the valve or valves for the distribution of steam in the cylinder. For an illustration of one form of valve gear, see Link motion.
Webster 1913