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In physics, the fundamental interactions, also known as fundamental forces, are the interactions that do not appear to be reducible to more basic interactions. There are four conventionally accepted fundamental interactionsgravitational, electromagnetic, strong nuclear, and weak nuclear. Each one is described mathematically as a field. The gravitational force is modelled as a continuous classical field. The other three, part of the Standard Model of particle physics, are described as discrete quantum fields, and their interactions are each carried by a quantum, an elementary particle. In his 1. 68. 7 theory, Isaac Newton postulated space as an infinite and unalterable physical structure existing before, within, and around all objects while their states and relations unfold at a constant pace everywhere, thus absolute space and time. Inferring that all objects bearing mass approach at a constant rate, but collide by impact proportional to their masses, Newton inferred that matter exhibits an attractive force. His law of universal gravitation mathematically stated it to span the entire universe instantly despite absolute time, or, if not actually a force, to be instant interaction among all objects despite absolute space. As conventionally interpreted, Newtons theory of motion modelled a central force without a communicating medium. Thus Newtons theory violated the first principle of mechanical philosophy, as stated by Descartes, No action at a distance. Conversely, during the 1. Michael Faraday inferred a field filling space and transmitting that force. Faraday conjectured that ultimately, all forces unified into one. In the early 1. 87. James Clerk Maxwell unified electricity and magnetism as effects of an electromagnetic field whose third consequence was light, travelling at constant speed in a vacuum. The electromagnetic field theory contradicted predictions of Newtons theory of motion, unless physical states of the luminiferous aetherpresumed to fill all space whether within matter or in a vacuum and to manifest the electromagnetic fieldaligned all phenomena and thereby held valid the Newtonian principle relativity or invariance. The exchange of bosons always carries energy and momentum between the fermions, thereby changing their speed and direction. The exchange may also transport a charge between the fermions, changing the charges of the fermions in the process e. Since bosons carry one unit of angular momentum, the fermions spin direction will flip from Plancks constant. Because an interaction results in fermions attracting and repelling each other, an older term for interaction is force. According to the present understanding, there are four fundamental interactions or forces gravitation, electromagnetism, the weak interaction, and the strong interaction. Their magnitude and behaviour vary greatly, as described in the table below. Modern physics attempts to explain every observed physical phenomenon by these fundamental interactions. Moreover, reducing the number of different interaction types is seen as desirable. Two cases in point are the unification of. Electric and magnetic force into electromagnetism. The electromagnetic interaction and the weak interaction into the electroweak interaction see below. Both magnitude relative strength and range, as given in the table, are meaningful only within a rather complex theoretical framework. It should also be noted that the table below lists properties of a conceptual scheme that is still the subject of ongoing research. Gravitation was the first interaction to be described mathematically. In ancient times, Aristotle hypothesized that objects of different masses fall at different rates. During the Scientific Revolution, Galileo Galilei experimentally determined that this was not the case neglecting the friction due to air resistance, and buoyancy forces if an atmosphere is present e. Earth at the same rate. Isaac Newtons law of Universal Gravitation 1. Our present day understanding of gravitation stems from Albert Einsteins General Theory of Relativity of 1. Merging general relativity and quantum mechanics or quantum field theory into a more general theory of quantum gravity is an area of active research. It is hypothesized that gravitation is mediated by a massless spin 2 particle called the graviton. The 1. 94. 7 discovery of the pion ushered in the modern era of particle physics. Hundreds of hadrons were discovered from the 1. Most notably. The pions were understood to be oscillations of vacuum condensates. Jun John Sakurai proposed the rho and omega vector bosons to be force carrying particles for approximate symmetries of isospin and hypercharge. 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