Definition of motion12/8/2023 ![]() In general, the term motion signifies a continuous change in the position or configuration of a physical system in space. One can also speak of the motion of images, shapes, and boundaries. Motion applies to various physical systems: objects, bodies, matter particles, matter fields, radiation, radiation fields, radiation particles, curvature, and space-time. As such, everything in the universe can be considered to be in motion. Modern physics holds that, as there is no absolute frame of reference, Newton's concept of absolute motion cannot be determined. If an object is not in motion relative to a given frame of reference, it is said to be at rest, motionless, immobile, stationary, or to have a constant or time-invariant position with reference to its surroundings. The branch of physics describing the motion of objects without reference to their cause is called kinematics, while the branch studying forces and their effect on motion is called dynamics. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and frame of reference to an observer, measuring the change in position of the body relative to that frame with a change in time. In physics, motion is the phenomenon by which an object changes its position with respect to time. The whirling motion of a Tanoura dancer, captured through long-exposure photography Send us feedback about these examples.For other uses, see Motion (disambiguation). These examples are programmatically compiled from various online sources to illustrate current usage of the word 'inertia.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Philip Ball, Scientific American, See More ![]() Jeffrey Sonnenfeld, Fortune, In this case, the fusing plasma is held in place only fleetingly by its own inertia after the experiment triggers fusion by squeezing the fuel abruptly and heating it intensely-a scheme called inertial confinement fusion. Timothy Noah, The New Republic, With no clear playbook, C-suites seem to be muddling through largely along three vastly divergent paths: significant withdrawal, gradual scaling back, and inertia (or even expansion). ![]() WIRED, 17 June 2023 As with much of defense spending in the United States, the trouble is some combination of inertia and parochial interests. 2023 Clearly, Reddit is hoping that inertia and customer loyalty keep people on its site. Christopher Flavelle,, 16 July 2023 Job 3 is to counteract the forces of inertia to get people moving from the current to the aspirational state. 2023 The trend could begin to dislodge the inertia that underlies America’s struggle to adapt to climate change: Technologies exist to protect homes against severe weather - but those innovations have been slow to seep into mainstream homebuilding. ![]() 2023 Therefore, drag strength, smooth operation, low start-up inertia, and heat resistance become important. Michael Barnett, Foreign Affairs, 14 Apr. Recent Examples on the Web There are politicians in all camps who want to keep a lid on the conflict, generally not in service of any strategy for resolution but out of a sense of inefficacy and inertia. ![]()
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