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#REDIRECT [[Inertia]] |
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Rest: If a body does not change its position with respect to its surroundings, the body is said to be at rest. E.g. A table lying in a room is at rest with respect to the walls of the room. Motion: A body is said to be in motion if it changes its position with respect to its surroundings. |
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== Description == |
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In physics, rest is the state an object being [[:wikt:Stationary|stationary]] relative to a particular [[frame of reference]] or another object; when the position of a body with respect to its surroundings does not change with [[time]] it is said to be "at rest". According to the [[theory of relativity]], it is said that an object is "at rest relative to" another. For example, a train [[Acceleration|decelerates]] approaching a station and eventually comes to rest alongside the platform. The train can be said to be "at rest with respect to the station", or, as the correct frame of reference is usually implicit and/or provided by context, simply "at rest". In reality, there is nothing at [[Absolute time and space|absolute]] rest. For example, [[Earth]]'s [[Gravity of Earth|gravitation]] constantly pulls objects toward its surface, while Earth is one of the objects the [[Sun]] constantly pulls towards itself, causing it to orbit the Sun; the Sun, in turn, orbits the center of the [[Milky Way]]; and so on. <!-- COMMENTED OUT BECAUSE THIS IS UNCLEAR DUE TO GRAMMAR USED -- But there is an exception of that if the force is not present in earth then how could the object attracted in gravity less zone. That is case of absolute rest when object have all things except force. Two or more than two objects are said to be at rest, if its position with respect to each other is not changing or moving with uniform velocity with respect to each other; rest and motion are relative terms. --> |
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== History == |
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Given an [[inertial frame of reference]], [[Newton's laws of motion|Newton's first law of motion]] states that an object at rest will remain at rest, while the [[Motion (physics)|motion]] of a moving object will remain unchanged until acted upon by an [[Force|external force]].<ref>{{cite web |last= |first= |authorlink= |title= Newton's first law |work= |publisher=The Physics classroom |date=2014-03-20 |url=http://www.physicsclassroom.com/class/newtlaws/Lesson-1/Newton-s-First-Law |format= |doi= |accessdate= |archiveurl= |archivedate=}}</ref><ref>{{Cite web|title = Newton's First Law of Motion|url = https://www.grc.nasa.gov/www/k-12/airplane/newton1g.html|website = www.grc.nasa.gov|access-date = 2016-02-09}}</ref> An object at rest, therefore, can be described as without [[velocity]] and [[acceleration]]—although, according to relativity, an object is either at rest or in motion relative to other moving objects. The concept of "relative rest" is closely linked to that of [[Inertial frame of reference|inertial observers]] and the statement that "nothing is at absolute rest" is loosely equivalent to stating that there are no frames of reference which are truly inertial. So-called non-inertial observers are addressed by the theory of [[general relativity]]. |
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== References == |
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{{Reflist}} |
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[[Category:Concepts in physics]] |
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{{Classicalmechanics-stub}} |
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Latest revision as of 22:22, 3 April 2021
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