This motion is the most obscure as it is not physical motion, but rather a change in the very nature of the universe.A body at rest stays at rest and a body in motion stays in motion with the same speed and in the same direction unless the body is acted upon by an external force. Spacetime (the fabric of the universe) is expanding, meaning everything in the universe is stretching, like a rubber band. The smaller scales of these motions are too small to be detected conventionally with human senses. The larger scales of imperceptible motions are difficult for humans to perceive for two reasons: Newton's laws of motion (particularly the third) which prevents the feeling of motion on a mass to which the observer is connected, and the lack of an obvious frame of reference which would allow individuals to easily see that they are moving. Many of these "imperceptible motions" are only perceivable with the help of special tools and careful observation. Humans, like all known things in the universe, are in constant motion : 8–9 however, aside from obvious movements of the various external body parts and locomotion, humans are in motion in a variety of ways which are more difficult to perceive. In addition to describing the motion of atomic level phenomena, quantum mechanics is useful in understanding some large-scale phenomena such as superfluidity, superconductivity, and biological systems, including the function of smell receptors and the structures of protein. In quantum mechanics, due to the Heisenberg uncertainty principle, the complete state of a subatomic particle, such as its location and velocity, cannot be simultaneously determined. In classical mechanics, accurate measurements and predictions of the state of objects can be calculated, such as location and velocity. These descriptions include the simultaneous wave-like and particle-like behavior of both matter and radiation energy as described in the wave–particle duality. Quantum mechanics is a set of principles describing physical reality at the atomic level of matter ( molecules and atoms) and the subatomic particles ( electrons, protons, neutrons, and even smaller elementary particles such as quarks). The development used differential geometry to describe a curved universe with gravity the study is called general relativity. Efforts to incorporate gravity into relativistic mechanics were made by W. This part of mechanics is special relativity. Acceleration, the change of velocity over time, then changes rapidity according to Lorentz transformations. For example, one can talk about the motion of a wave or the motion of a quantum particle, where the configuration consists of the probabilities of the wave or particle occupying specific positions. 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 For other uses, see Motion (disambiguation).
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