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| {{about|a form of energy in physics|the statistical method|Potential energy statistics}}
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| <!-- references seem to have been provided --{{Refimprove|date=June 2010}} --->
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| {{Infobox physical quantity
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| |bgcolour={default}
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| |name = Potential energy
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| |image=[[File:Mediaeval archery reenactment.jpg|300px]]
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| |caption=In the case of a [[bow and arrow]], the energy is converted from the potential energy in the archer's arm to the potential energy in the bent limbs of the bow when the string is drawn back. When the string is released, the potential energy in the bow limbs is transferred back through the string to become [[kinetic energy]] in the arrow as it takes flight.
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| |unit = [[joule]] (J)
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| |symbols = ''PE'', ''U'', or ''V''
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| |derivations = ''U'' = ''[[mass|m]]'' · ''[[Gravity of Earth|g]]'' · ''[[height|h]]'' ([[gravitational potential energy|gravitational]])<br>
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| ''U'' = ½ · ''[[Hooke's law|k]]'' · ''[[Stress (mechanics)|x]]''<sup>2</sup> ([[elastic potential energy|elastic]]) <br>
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| ''U'' = ''[[Capacitance|C]]'' · ''[[Electric potential|V]]''<sup>2</sup> / 2 ([[electric potential energy|electric]])<br>
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| ''U'' = -''[[Magnetic moment|m]]'' · ''[[Magnetic field|B]]'' ([[magnetic potential energy|magnetic]])
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| }}
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| {{Classical mechanics}}
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| In [[physics]], '''potential energy''' is [[energy]] stored in a system of forcefully interacting physical entities .<ref>{{cite book|author=McCall, Robert P.|chapter=Energy, Work and Metabolism|title=Physics of the Human Body|publisher=JHU Press|year=2010|isbn=978-0-8018-9455-8|page=74|url=http://books.google.com/books?id=LSyC41h6CG8C&pg=PA74}}</ref>
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| The [[International System of Units|SI unit]] for measuring work and energy is the [[joule]] (symbol J).
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| The term ''potential energy'' was introduced by the 19th century Scottish engineer and physicist [[William Rankine]],<ref>William John Macquorn Rankine (1853) "On the general law of the transformation of energy," ''Proceedings of the Philosophical Society of Glasgow'', vol. 3, no. 5, pages 276-280; reprinted in: '''(1)''' ''Philosophical Magazine'', series 4, vol. 5, no. 30, [http://books.google.com/books?id=3Ov22-gFMnEC&pg=PA106&lpg=PA106#v=onepage&q&f=false pages 106-117] (February 1853); and '''(2)''' W. J. Millar, ed., ''Miscellaneous Scientific Papers: by W. J. Macquorn Rankine'', ... (London, England: Charles Griffin and Co., 1881), part II, [http://books.google.com/books?id=-kRB9v6KRvsC&pg=PA203&lpg=PA203#v=onepage&q&f=false pages 203-208].</ref><ref>{{Cite book| last = Smith | first = Crosbie | title = The Science of Energy - a Cultural History of Energy Physics in Victorian Britain | publisher = The University of Chicago Press | year = 1998 | isbn = 0-226-76420-6}}</ref> although it has links to Greek philosopher [[Aristotle]]'s concept of [[Potentiality and Actuality|potentiality]].
| | He got back late, and looked so tired I said I�d order a Rasa curry, which I did. So, on Friday, I emailed him in the morning to say that I�d been worried by the fact that he�d read the address of my London flat on the internet. They wanted to phone us back, so I reminded David I�d lost my BlackBerry, and have no idea what the number of the Bat Phone is.<br><br>I keep conjuring up images of him in 1983, trying to reignite the passion. <br>I told him, before he started wriggling, that I think that memorable evening, when after our game of squash he had asked me to take his racquet home for him because he had a date, he had already started seeing the woman he would marry.<br><br>He bought me a bottle of prosecco, and some shopping. On Sunday, we went to the Matisse exhibition at the Tate Modern (walking round the exhibit, talking, made me feel as though we were in a Woody Allen movie), and again his car had a parking ticket on it when we returned to it. This time, though, he didn�t hand it to me, although it�s sitting, accusingly, on my desk.<br><br>The whole phone, in fact, is a gleaming object of desire but it lacks standout new features other than the cameras, so you�ll miss out on gizmos such as the Samsung S5�s fingerprint scanner, or LG G3�s frankly frightening Quad HD screen.<br><br>99 ★★★★★Most of us who can be considered vaguely literate felt a faint anger when the term �selfie� passed from geek-speak into common parlance, especially after this year�s famous examples at the Oscars and Nelson Mandela�s funeral, where Barack Obama snuggled up to [http://search.huffingtonpost.com/search?q=David+Cameron&s_it=header_form_v1 David Cameron]. Huawei Ascend P7 �329.<br><br>And don�t say, �Don�t give me a hard time� when it�s you giving me a hard time. I did nothing today other than work hard and order dinner. 'Have a great life together, just leave me out of it. �You know I have no interest in her. I didn�t realise you had taken my keys back. I hope that was just a fit of pique. �<br>This came back the next morning, when he�d arrived at work. I love you and no one else. I have to work now, but I�ll see you tonight, as usual. My life is an open book to you.<br><br>Isobel and Dawn are in situ already, chilling the wine. Lots of books on Kindle. My Accessorize pink bikini. Wow, are we going to whip up some copy! What about the wedding proposal on the Pampelonne beach and me and Dawn can scatter white rose petals. Xxx� <br>The thing is, I�m not even sure David is still coming� Packing in tissue paper tonight: The Row sunglasses. My Dries negligee dress. Isobel has just sent me a message�<br>�The cast of Liz Jones�s Diary are off to the South of France. Let�s get this show on the road!<br><br>She had written to him three times, about him giving her his car (His reply: �I will send you the log book�), and having found his bow tie (His reply: �I spent �75 on one last week.<br><br>The famous Oscars �selfie� taken by Bradley Cooper and featuring Angelina Jolie, Brad Pitt, Meryl Streep, Julia Roberts, Ellen DeGeneres, Jennifer Lawrence, Lupita Nyong�o, her brother Peter, Kevin Spacey, Jared Leto and Channing Tatum<br>But Huawei (pronounced like the reverse of a jubilant �Whahey�) needed to add to the language to sum up the purpose of its new Ascend P7�s stand-out feature - a forward-facing eight-megapixel camera, with the option for panoramic shots. By law, this is the only phone you�ll be taking �groufies� on - although as yet, the trademark doesn�t apply in the UK, so users of other phones can still use it for their own work. Unless you�re the size of a Weight Watchers �before� picture, there�s only one reason for this to exist - a �group selfie� (ie, a group shot where one of you holds the camera) - hence �groufie�. Huawei is so proud of the word the company trademarked it in several countries to mark the launch of the P7.<br><br>In case you�re wondering what Huawei is, it�s one of those Chinese companies that only recently began hawking smartphones in the West, and shifts so many phones in the Far East it�s the third biggest phone company on Earth.<br><br>Upstage selfie-toting friends by turning you and your pals into a real 3D-model (warning: there�s a fair bit of work involved), ready to print off. The app �walks� you round anything to [http://Search.Un.org/search?ie=utf8&site=un_org&output=xml_no_dtd&client=UN_Website_en&num=10&lr=lang_en&proxystylesheet=UN_Website_en&oe=utf8&q=capture&Submit=Go capture] it in 3D - now all you need is a few hundred quid for a 3D printer.<br><br>Huawei�s invention of the g-word, and the panoramic software to make it a reality, is down to a feeling that the endless Twitter parade of selfies (both celebrity and human), might be improved with a bit of context. And in action, it�s impressive too.<br><br>WOLFENSTEIN: THE NEW ORDER�40, PC, CONSOLES<br>The biggest surprise in Wolfensteing: The New Order is that it's the tense plotting that lifts this violent tale above its beige rivals <br>With an alternate-history plot hewn from the finest codswallop - a Nazi general uses high technology to summon an army of robots and zombies - the biggest surprise here is that it�s the tense plotting that lifts this violent tale above its beige rivals. ★★★★★<br><br>If you cherished this short article and you would like to get extra details about [http://nouveauclashofclanstriche.blogspot.com/ http://nouveauclashofclanstriche.blogspot.com/] kindly visit our webpage. |
| Potential energy is associated with forces that act on a body in a way that depends only on the body's position in space. These forces can be represented by vector at every point in space forming what is known as a [[vector field]] of forces, or a [[force field (physics)|force field]].
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| If the work of a force field acting on a body that moves from a start to an end position is defined only by these two positions, and does not depend on the trajectory of the body, then there is a function known as ''potential energy'' that can be evaluated at the two positions to determine this work. Furthermore, the force field is defined by this potential energy and is described as derivable from a potential.
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| ==Overview==
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| Potential energy is often associated with restoring [[force]]s such as a [[spring (device)|spring]] or the force of [[gravity]]. The action of stretching the spring or lifting the mass is performed by an external force that works against the force field of the potential. This work is stored in the force field, which is said to be stored as potential energy. If the external force is removed the force field acts on the body to perform the work as it moves the body back to the initial position, reducing the stretch of the spring or causing a body to fall.
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| The more formal definition is that potential energy is the energy difference between the energy of an object in a given position and its energy at a reference position.
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| There are various types of potential energy, each associated with a particular type of force. For example, the work of an [[Elasticity (physics)|elastic]] force is called elastic potential energy; work of the gravitational force is called gravitational potential energy; work of the [[Coulomb force]] is called [[electric potential energy]]; work of the [[strong nuclear force]] or [[weak nuclear force]] acting on the [[baryon]] [[charge (physics)|charge]] is called nuclear potential energy; work of [[intermolecular forces]] is called intermolecular potential energy. Chemical potential energy, such as the energy stored in [[fossil fuels]], is the work of the Coulomb force during rearrangement of mutual positions of electrons and nuclei in atoms and molecules. Thermal energy usually has two components: the kinetic energy of random motions of particles and the potential energy of their mutual positions.
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| Forces derivable from a potential are also called [[conservative force]]s. The work done by a conservative force is
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| :<math>\,W = -\Delta U</math>
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| where <math>\Delta U</math> is the change in the potential energy associated with the force. The negative sign provides the convention that work done against a force field increases potential energy, while work done by the force field decreases potential energy. Common notations for potential energy are ''U'', ''V'', and ''E<sub>p</sub>''.
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| ==Work and potential energy==
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| The work of a force acting on a moving body yields a difference in potential energy when the integration of the work is path independent. The scalar product of a force '''F''' and the velocity '''v''' of its point of application defines the [[power (physics)|power]] input to a system at an instant of time. Integration of this power over the trajectory of the point of application, ''d''='''x'''(t), defines the work input to the system by the force.
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| If the work for an applied force is independent of the path, then the work done by the force is evaluated at the start and end of the trajectory of the point of application. This means that there is a function ''U'' ('''x'''), called a "potential," that can be evaluated at the two points '''x'''(t<sub>1</sub>) and '''x'''(t<sub>2</sub>) to obtain the work over any trajectory between these two points. It is tradition to define this function with a negative sign so that positive work is a reduction in the potential, that is
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| :<math>W = \int_C \bold{F} \cdot \mathrm{d}\bold{x} = \int_{\mathbf{x}(t_1)}^{\mathbf{x}(t_2)} \bold{F} \cdot \mathrm{d}\bold{x} = U(\mathbf{x}(t_1))-U(\mathbf{x}(t_2)).
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| </math>
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| The function ''U''('''x''') is called the potential energy associated with the applied force. Examples of forces that have potential energies are gravity and spring forces.
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| In this case, the application of the [[del operator]] to the work function yields, by the [[gradient theorem]],
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| :<math> {\nabla W} = -{\nabla U} = -\left ( \frac{\partial U}{\partial x}, \frac{\partial U}{\partial y}, \frac{\partial U}{\partial z} \right ) = \mathbf{F},</math>
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| and the force '''F''' is said to be "derivable from a potential."<ref>{{cite book|author=John Robert Taylor|title=Classical Mechanics|url=http://books.google.com/books?id=P1kCtNr-pJsC&pg=PA117|accessdate=30 July 2013|year=2005|publisher=University Science Books|isbn=978-1-891389-22-1}}</ref>
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| Because the potential ''U'' defines a force '''F''' at every point '''x''' in space, the set of forces is called a [[force field (physics)|force field]]. The power applied to a body by a force field is obtained from the gradient of the work, or potential, in the direction of the velocity '''V''' of the body, that is
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| :<math>P(t) = -{\nabla U} \cdot \mathbf{v} = \mathbf{F}\cdot\mathbf{v}.</math>
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| Examples of work that can be computed from potential functions are gravity and spring forces.<ref>{{cite book|author=Burton Paul|title=Kinematics and dynamics of planar machinery|url=http://books.google.com/books?id=3UdSAAAAMAAJ|accessdate=30 July 2013|year=1979|publisher=Prentice-Hall|isbn=978-0-13-516062-6}}</ref>
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| ===Potential function for near Earth gravity===
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| In classical physics, gravity exerts a constant downward force '''''F'''''=(0, 0, ''F<sub>z</sub>'') on the center of mass of a body moving near the surface of the Earth. The work of gravity on a body moving along a trajectory '''''s'''''(t) = (''x''(t), ''y''(t), ''z''(t)), such as the track of a roller coaster is calculated using its velocity, '''''v'''''=(''v''<sub>x</sub>, ''v''<sub>y</sub>, ''v''<sub>z</sub>), to obtain
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| :<math>W=\int_{t_1}^{t_2}\boldsymbol{F}\cdot\boldsymbol{v}dt = \int_{t_1}^{t_2}F_z v_z dt = F_z\Delta z. </math>
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| where the integral of the vertical component of velocity is the vertical distance. Notice that the work of gravity depends only on the vertical movement of the curve '''''s'''''(t).
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| The function ''U''('''''s''''')=''mgh'' is called the potential energy of a near earth gravity field.
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| ===Potential function for a linear spring===
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| A horizontal spring exerts a force '''''F'''''=(''kx'', 0, 0) that is proportional to its deflection in the ''x'' direction. The work of this spring on a body moving along the space curve '''''s'''''(t) = (''x''(t), ''y''(t), ''z''(t)), is calculated using its velocity, '''''v'''''=(''v''<sub>x</sub>, ''v''<sub>y</sub>, ''v''<sub>z</sub>), to obtain
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| :<math>W=\int_0^t\boldsymbol{F}\cdot\boldsymbol{v}dt =\int_0^tkx v_x dt = \frac{1}{2}kx^2. </math>
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| For convenience, consider contact with the spring occurs at ''t'' = 0, then the integral of the product of the distance ''x'' and the ''x''-velocity, ''xv<sub>x</sub>, is (1/2)x''<sup>2</sup>.
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| The function ''U''(''x'')= 1/2 ''kx''<sup>2</sup> is called the potential energy of a linear spring.
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| ==Reference level==
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| The potential energy is a function of the state a system is in, and is defined relative to that for a particular state. This reference state is not always a real state, it may also be a limit, such as with the distances between all bodies tending to infinity, provided that the energy involved in tending to that limit is finite, such as in the case of [[inverse-square law]] forces. Any arbitrary reference state could be used, therefore it can be chosen based on convenience.
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| Typically the potential energy of a system depends on the ''relative'' positions of its components only, so the reference state can also be expressed in terms of relative positions.
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| ==Gravitational potential energy==
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| {{Main|Gravitational potential|Gravitational energy}}
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| Gravitational energy is the potential energy associated with [[gravitational force]], as work is required to elevate objects against Earth's gravity. The potential energy due to elevated positions is called gravitational potential energy, and is evidenced by water in an elevated reservoir or kept behind a dam. If an object falls from one point to another point inside a gravitational field, the force of gravity will do positive work on the object, and the gravitational potential energy will decrease by the same amount.
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| [[Image:Solar sys.jpg|right|thumb|Gravitational force keeps the planets in orbit around the [[Sun]].]]
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| [[Image:Trebuchet.jpg|right|thumb|A [[trebuchet]] uses the gravitational potential energy of the [[counterweight]] to throw projectiles over relatively long distances.]]
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| Consider a book placed on top of a table. As the book is raised from the floor, to the table, some external force works against the gravitational force. If the book falls back to the floor, the "falling" energy the book receives is provided by the gravitational force. Thus, if the book falls off the table, this potential energy goes to accelerate the mass of the book and is converted into [[kinetic energy]]. When the book hits the floor this kinetic energy is converted into heat and sound by the impact.
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| The factors that affect an object's gravitational potential energy are its height relative to some reference point, its mass, and the strength of the gravitational field it is in. Thus, a book lying on a table has less gravitational potential energy than the same book on top of a taller cupboard, and less gravitational potential energy than a heavier book lying on the same table. An object at a certain height above the Moon's surface has less gravitational potential energy than at the same height above the Earth's surface because the Moon's gravity is weaker. Note that "height" in the common sense of the term cannot be used for gravitational potential energy calculations when gravity is not assumed to be a constant. The following sections provide more detail.
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| === Local approximation ===
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| The strength of a gravitational field varies with location. However, when the change of distance is small in relation to the distances from the center of the source of the gravitational field, this variation in field strength is negligible and we can assume that the force of gravity on a particular object is constant. Near the surface of the Earth, for example, we assume that the acceleration due to gravity is a constant {{nowrap|1=''g'' = 9.8 m/s<sup>2</sup>}} ("[[standard gravity]]"). In this case, a simple expression for gravitational potential energy can be derived using the ''W'' = ''Fd'' equation for [[mechanical work|work]], and the equation
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| :<math>W_F = -\Delta U_F.\!</math>
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| The amount of gravitational potential energy possessed by an elevated object is equal to the work done against gravity in lifting it. The work done equals the force required to move it upward multiplied with the vertical distance it is moved (remember ''W = Fd''). The upward force required while moving at a constant velocity is equal to the weight, ''mg'', of an object, so the work done in lifting it through a height ''h'' is the product ''mgh''. Thus, when accounting only for [[mass]], [[Gravitation|gravity]], and [[altitude]], the equation is:<ref>{{cite book|author=Feynman, Richard P.|chapter=Work and potential energy|title=The Feynman Lectures on Physics, Vol. I|publisher=Basic Books|year=2011|isbn=978-0-465-02493-3|page=13|url=http://books.google.com/books?id=bDF-uoUmttUC&pg=SA13-PA1}}</ref>
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| :<math>U = mgh\!</math>
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| where ''U'' is the potential energy of the object relative to its being on the Earth's surface, ''m'' is the mass of the object, ''g'' is the acceleration due to gravity, and ''h'' is the altitude of the object.<ref>{{cite web|url=http://hyperphysics.phy-astr.gsu.edu/Hbase/gpot.html|title=Hyperphysics - Gravitational Potential Energy}}</ref> If ''m'' is expressed in [[kilogram]]s, ''g'' in [[metre per second squared|m/s<sup>2</sup>]] and ''h'' in [[metre]]s then ''U'' will be calculated in [[joule]]s.
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| Hence, the potential difference is
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| :<math>\,\Delta U = mg \Delta h.\ </math>
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| === General formula ===
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| However, over large variations in distance, the approximation that ''g'' is constant is no longer valid, and we have to use [[calculus]] and the general mathematical definition of work to determine gravitational potential energy. For the computation of the potential energy we can [[integral|integrate]] the gravitational force, whose magnitude is given by [[Law of universal gravitation|Newton's law of gravitation]], with respect to the distance ''r'' between the two bodies. Using that definition, the gravitational potential energy of a system of masses ''m''<sub>1</sub> and ''M''<sub>2</sub> at a distance ''r'' using [[gravitational constant]] ''G'' is
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| :<math>U = -G \frac{m_1 M_2}{r}\ + K</math>,
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| where ''K'' is the [[constant of integration]]. Choosing the convention that ''K''=0 makes calculations simpler, albeit at the cost of making ''U'' negative; for why this is physically reasonable, see below.
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| Given this formula for ''U'', the total potential energy of a system of ''n'' bodies is found by summing, for all <math>\frac{n ( n - 1 )}{2}</math> pairs of two bodies, the potential energy of the system of those two bodies.
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| [[File:Gravitational potential summation 2.png|thumb|Gravitational potential summation <math>U = - m (G \frac{ M_1}{r_1}+ G \frac{ M_2}{r_2}) </math>]]Considering the system of bodies as the combined set of small particles the bodies consist of, and applying the previous on the particle level we get the negative [[gravitational binding energy]]. This potential energy is more strongly negative than the total potential energy of the system of bodies as such since it also includes the negative gravitational binding energy of each body. The potential energy of the system of bodies as such is the negative of the energy needed to separate the bodies from each other to infinity, while the gravitational binding energy is the energy needed to separate all particles from each other to infinity.
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| :<math>U = - m \left(G \frac{ M_1}{r_1}+ G \frac{ M_2}{r_2}\right) </math>
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| therefore,
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| :<math>U = - m \sum G \frac{ M}{r} </math>,
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| ===Why choose a convention where gravitational energy is negative?===
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| As with all potential energies, only differences in gravitational potential energy matter for most physical purposes, and the choice of zero point is arbitrary. Given that there is no reasonable criterion for preferring one particular finite ''r'' over another, there seem to be only two reasonable choices for the distance at which ''U'' becomes zero: <math>r=0</math> and <math>r=\infty</math>. The choice of <math>U=0</math> at infinity may seem peculiar, and the consequence that gravitational energy is always negative may seem counterintuitive, but this choice allows gravitational potential energy values to be finite, albeit negative.
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| The [[mathematical singularity|singularity]] at <math>r=0</math> in the formula for gravitational potential energy means that the only other apparently reasonable alternative choice of convention, with <math>U=0</math> for <math>r=0</math>, would result in potential energy being positive, but infinitely large for all nonzero values of ''r'', and would make calculations involving sums or differences of potential energies beyond what is possible with the [[real number]] system. Since physicists abhor infinities in their calculations, and ''r'' is always non-zero in practice, the choice of <math>U=0</math> at infinity is by far the more preferable choice, even if the idea of negative energy in a [[gravity well]] appears to be peculiar at first.
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| The negative value for gravitational energy also has deeper implications that make it seem more reasonable in cosmological calculations where the total energy of the universe can meaningfully be considered; see [[inflation theory]] for more on this.
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| ===Uses===
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| <!-- Unsourced image removed: [[Image:Dynorwic.JPG|thumb|right|Dinorwig, Wales, the site of a hydroelectric power station that utilises gravitional potential energy|{{Deletable image-caption|1=Wednesday, 1 April 2009|date=February 2012}}]] -->
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| Gravitational potential energy has a number of practical uses, notably the generation of [[hydroelectricity]]. For example in [[Dinorwig Power Station|Dinorwig]], Wales, there are two lakes, one at a higher elevation than the other. At times when surplus electricity is not required (and so is comparatively cheap), water is pumped up to the higher lake, thus converting the electrical energy (running the pump) to gravitational potential energy. At times of peak demand for electricity, the water flows back down through electrical generator turbines, converting the potential energy into kinetic energy and then back into electricity. {{Citation needed|date=February 2012}} (The process is not completely efficient and some of the original energy from the surplus electricity is in fact lost to friction.) See also [[pumped storage]].
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| Gravitational potential energy is also used to power clocks in which falling weights operate the mechanism.{{clear right}} It's also used by [[counterweight]]s for lifting up an [[elevator]], crane, or [[sash window]].
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| [[Rollercoasters|Roller coasters]] are an entertaining way to utilize potential energy - chains are used to move a car up an incline (building up gravitational potential energy), to then have that energy converted into kinetic energy as it falls.
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| Another practical use is utilizing gravitational potential energy to descend (perhaps coast) downhill in transportation such as the descent of an automobile, truck, railroad train, bicycle, airplane, or fluid in a pipeline. In some cases the [[kinetic energy]] obtained from potential energy of descent may be used to start ascending the next grade such as what happens when a road is undulating and has frequent dips.
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| ==Elastic potential energy==
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| [[Image:Springs 009.jpg|thumb|right|200px|[[Spring (device)|Springs]] are used for storing [[elastic potential energy]]]]
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| [[Image:Longbowmen.jpg|thumb|right|200px|[[Archery]] is one of humankind's oldest applications of elastic potential energy.]]
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| {{Main|Elastic potential energy}}
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| Elastic potential energy is the potential energy of an [[elasticity (physics)|elastic]] object (for example a [[bow (weapon)|bow]] or a catapult) that is deformed under tension or compression (or [[stress (physics)|stressed]] in formal terminology). It arises as a consequence of a force that tries to restore the object to its original shape, which is most often the [[electromagnetic force]] between the atoms and molecules that constitute the object. If the stretch is released, the energy is transformed into [[kinetic energy]].
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| ===Calculation of elastic potential energy===
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| The elastic potential energy stored in a stretched spring can be calculated by finding the work necessary to stretch the spring a distance x from its un-stretched length:
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| :<math>U = -\int\vec{F}\cdot d\vec{x} </math>
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| an ideal spring will follow [[Hooke's Law]]:
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| :<math>F=-k \Delta x\,</math>
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| The work done (and therefore the stored potential energy) will then be:
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| :<math>U = -\int\vec{F}\cdot d\vec{x}=-\int {-k x}\, dx = \frac {1} {2} k x^2.</math>
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| The units are in joules (J).
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| The equation is often used in calculations of positions of [[mechanical equilibrium]]. This equation can also be stated as:
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| :<math> U = \frac{1}{2}k \Delta x^2\,</math>
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| ==Chemical potential energy==
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| {{Main|Chemical energy}}
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| Chemical potential energy is a form of potential energy related to the structural arrangement of atoms or molecules. This arrangement may be the result of [[chemical bond]]s within a molecule or otherwise. Chemical energy of a chemical substance can be transformed to other forms of energy by a [[chemical reaction]]. As an example, when a fuel is burned the chemical energy is converted to heat, same is the case with digestion of food metabolized in a biological organism. Green plants transform [[solar energy]] to chemical energy through the process known as [[photosynthesis]], and electrical energy can be converted to chemical energy through [[electrochemical]] reactions.
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| The similar term [[chemical potential]] is used to indicate the potential of a substance to undergo a change of configuration, be it in the form of a chemical reaction, spatial transport, particle exchange with a reservoir, etc.
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| ==Electric potential energy==
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| {{Main|Electric potential energy}}
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| An object can have potential energy by virtue of its [[electric charge]] and several forces related to their presence. There are two main types of this kind of potential energy: electrostatic potential energy, electrodynamic potential energy (also sometimes called magnetic potential energy).
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| [[Image:Plasma-lamp 2.jpg|right|250px|thumb|Plasma formed inside a gas filled sphere]]
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| ===Electrostatic potential energy===
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| In case the electric charge of an object can be assumed to be at rest, it has potential energy due to its position relative to other charged objects.
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| The [[electric potential energy|electrostatic potential energy]] is the energy of an electrically charged particle (at rest) in an electric field. It is defined as the [[work (physics)|work]] that must be done to move it from an infinite distance away to its present location, adjusted for non-electrical forces on the object. This energy will generally be non-zero if there is another electrically charged object nearby.
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| The simplest example is the case of two point-like objects A<sub>1</sub> and A<sub>2</sub> with electrical charges ''q''<sub>1</sub> and ''q''<sub>2</sub>. The work ''W'' required to move A<sub>1</sub> from an infinite distance to a distance ''r'' away from A<sub>2</sub> is given by:
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| :<math>W=\frac{1}{4\pi\varepsilon_0}\frac{q_1q_2}{r},</math>
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| where ''ε''<sub>0</sub> is the [[vacuum permittivity]]. This may also be written using [[Coulomb's constant]] {{nowrap|1=''k''<sub>e</sub> = 1 ⁄ 4πε<sub>0</sub>}}.
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| This equation may be obtained by integrating the [[Coulomb force]] between the limits of infinity and ''r''.
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| A related quantity called ''[[electric potential]]'' (commonly denoted with a ''V'' for voltage) is equal to the electric potential energy per unit charge.
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| ===Magnetic potential energy===
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| The energy of a [[magnetic moment]] {{math|'''m'''}} in an externally produced [[Magnetic field|magnetic B-field]] {{math|'''B'''}} has potential energy<ref>{{cite book|last=Aharoni|first=Amikam|title=Introduction to the theory of ferromagnetism|year=1996|publisher=Clarendon Pr.|location=Oxford|isbn=0-19-851791-2|edition=Repr.}}</ref>
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| : <math>U=-\mathbf{m}\cdot\mathbf{B}. </math>
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| The [[magnetization]] {{math|'''M'''}} in a field is
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| :<math> U = -\frac{1}{2}\int \mathbf{M}\cdot\mathbf{B} dV, </math>
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| where the integral can be over all space or, equivalently, where {{math|'''M'''}} is nonzero.<ref>{{cite book|last=Jackson|first=John David|author-link=John David Jackson (physicist) |title=Classical electrodynamics|year=1975|publisher=Wiley|location=New York|isbn=0-471-43132-X|edition=2d}}</ref>
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| Magnetic potential energy is the form of energy related not only to the distance between magnetic materials, but also to the orientation, or alignment, of those materials within the field. For example, the needle of a compass has the lowest magnetic potential energy when it is aligned with the north and south poles of the Earth's magnetic field. If the needle is moved by an outside force, torque is exerted on the magnetic dipole of the needle by the Earth's magnetic field, causing it to move back into alignment. The magnetic potential energy of the needle is highest when it is perpendicular to the Earth's magnetic field. Two magnets will have potential energy in relation to each other and the distance between them, but this also depends on their orientation. If the opposite poles are held apart, the potential energy will be the highest when they are near the edge of their attraction, and the lowest when they pull together. Conversely, like poles will have the highest potential energy when forced together, and the lowest when they spring apart.<ref>{{cite book|first=James D.|last=Livingston|title=Rising Force: The Magic of Magnetic Levitation|publisher=President and Fellows of Harvard College|year=2011|page=152}}</ref><ref>{{cite book|first=Narinder|last=Kumar|title=Comprehensive Physics XII|publisher=Laxmi Publications|year=2004|page=713}}</ref>
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| ==Nuclear potential energy==<!--[[Nuclear potential energy]] redirects here-->
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| Nuclear potential energy is the potential energy of the [[nuclear particles|particles]] inside an [[atomic nucleus]]. The nuclear particles are bound together by the [[strong nuclear force]]. [[Weak nuclear force]]s provide the potential energy for certain kinds of radioactive decay, such as [[beta decay]].
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| Nuclear particles like protons and neutrons are not destroyed in fission and fusion processes, but collections of them have less mass than if they were individually free, and this mass difference is liberated as heat and radiation in nuclear reactions (the heat and radiation have the missing mass, but it often escapes from the system, where it is not measured). The energy from the [[Sun]] is an example of this form of energy conversion. In the Sun, the process of hydrogen fusion converts about 4 million tonnes of solar matter per second into [[electromagnetic energy]], which is radiated into space.
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| ==Relation between potential energy, potential and force==
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| Potential energy is closely linked with [[force (physics)|forces]]. If the work done moving along a path which starts and ends in the same location is zero, then the force is said to be [[Conservative force|conservative]] and it is possible to define a numerical value of [[Scalar potential|potential]] associated with every point in space. A force field can be re-obtained by taking the negative of the [[gradient|vector gradient]] of the potential field.
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| For example, gravity is a [[conservative force]]. The associated potential is the [[gravitational potential]], often denoted by <math>\phi</math> or <math>V</math>, corresponding to the energy per unit mass as a function of position. The gravitational potential energy of two particles of mass ''M'' and ''m'' separated by a distance ''r'' is
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| :<math>U = -\frac{G M m}{r},</math>
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| The gravitational potential ([[specific orbital energy|specific energy]]) of the two bodies is
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| :<math>\phi = -\left( \frac{GM}{r} + \frac{Gm}{r} \right)= -\frac{G(M+m)}{r} = -\frac{GMm}{\mu r} = \frac{U}{\mu}.</math>
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| where <math>\mu</math> is the [[reduced mass]].
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| The work done against gravity by moving an [[test particle|infinitesimal mass]] from point A with <math>U = a</math> to point B with <math>U = b</math> is <math>(b - a)</math> and the work done going back the other way is <math>(a - b)</math> so that the total work done in moving from A to B and returning to A is
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| : <math>U_{A \to B \to A} = (b - a) + (a - b) = 0. \,</math>
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| If the potential is redefined at A to be <math>a + c</math> and the potential at B to be <math>b + c</math>, where <math>c</math> is a constant (i.e. <math>c</math> can be any number, positive or negative, but it must be the same at A as it is at B) then the work done going from A to B is
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| : <math>U_{A \to B} = (b + c) - (a + c) = b - a \,</math>
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| as before.
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| In practical terms, this means that one can set the zero of <math>U</math> and <math>\phi</math> anywhere one likes. One may set it to be zero at the surface of the [[Earth]], or may find it more convenient to set zero at infinity (as in the expressions given earlier in this section).
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| A thing to note about conservative forces is that the work done going from A to B does not depend on the route taken. If it did then it would be pointless to define a potential at each point in space. An example of a non-conservative force is friction. With friction, the route taken does affect the amount of work done, and it makes little sense to define a potential associated with friction.
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| All the examples above are actually force field stored energy (sometimes in disguise). For example in elastic potential energy, stretching an elastic material forces the atoms very slightly further apart. The equilibrium between [[electromagnetic force]]s and [[Pauli repulsion]] of electrons (they are [[fermions]] obeying [[Fermi statistics]]) is slightly violated resulting in a small returning force. Scientists rarely discuss forces on an [[atom]]ic scale. Often interactions are described in terms of energy rather than force. One may think of potential energy as being derived from force or think of force as being derived from potential energy (though the latter approach requires a definition of energy that is independent from force which does not currently exist).
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| A conservative force can be expressed in the language of [[differential geometry]] as a [[closed differential form|closed form]]. As Euclidean space is [[contractible space|contractible]], its [[de Rham cohomology]] vanishes, so every closed form is also an [[exact differential form|exact form]], and can be expressed as the gradient of a scalar field. This gives a mathematical justification of the fact that all conservative forces are gradients of a potential field.
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| ==Notes==
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| {{Reflist}}
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| ==References==
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| * {{Cite book| author=Serway, Raymond A.; Jewett, John W. | title=Physics for Scientists and Engineers (8th ed.) | publisher=Brooks/Cole cengage | year=2010 | isbn=1-4390-4844-4}}
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| * {{Cite book| author=Tipler, Paul | title=Physics for Scientists and Engineers: Mechanics, Oscillations and Waves, Thermodynamics (5th ed.) | publisher=W. H. Freeman | year=2004 | isbn=0-7167-0809-4}}
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| ==External links==
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| * [http://www.kineticenergys.com/potential-energy What is potential energy?]
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| {{Use dmy dates|date=September 2010}}
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| {{Footer energy}}
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| {{DEFAULTSORT:Potential Energy}}
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| [[Category:Forms of energy]]
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| [[Category:Gravitation]]
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| [[Category:Potentials| ]]
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The famous Oscars �selfie� taken by Bradley Cooper and featuring Angelina Jolie, Brad Pitt, Meryl Streep, Julia Roberts, Ellen DeGeneres, Jennifer Lawrence, Lupita Nyong�o, her brother Peter, Kevin Spacey, Jared Leto and Channing Tatum
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