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Positionand its various derivatives specify an ordered power structure of meaningfulconcepts. There are special names because that the derivatives of position(first derivative is dubbed velocity, second derivative is calledacceleration, etc.), up to the eighth derivative and down come the -5thderivative (fifth integral).These derivatives the position and their matching names and also special significance are together follows:

0th derivative is position

In physics, displacement is the vectorthat states the readjust in position of a point, particle, or object.The place vector directs native the reference point to the presentposition.A sensor is stated to be displacement-sensitive once it responds to pure position.For example, conversely, a dynamic microphone is a velocity recipient (responds come the derivative that sound press or position), a carbon microphone is a displacement receiver in the sense that the responds to sound push or diaphragm position itself.

1st derivative is velocity

is characterized as the price of change of place or the price of displacement. That is a vector physical quantity, both speed and direction are forced to define it. In the SI (metric) system, it is measured in meters per 2nd (m/s). The scalar absolute worth (magnitude) of velocity is speed.For example, "5 metres every second" is a speed and not a vector, whereas"5 metres per second east" is a vector. The average velocity (v) of an item moving through a displacement (
) in a directly line throughout a time interval (
) is described by the formula:
Simply put, velocity is readjust in position per unit that time.Most piano-style music key-boards are around velocity-sensitive,within a specific specific, though limited range of key travel, i.e. Toa first-order approximation, a keep in mind is make louder by hitting a keyfaster. Most electronic music key-boards are also velocity sensitive,and measure the time interval in between switch call closures at twodifferent positions of vital travel on each key.

2nd derivative is acceleration

is defined as the rate of change of velocity. That is therefore a vector amount with measurement length/time². In SI units, acceleration is measured in metres/second² (m·s-²). The hatchet "acceleration" usually refers come the readjust in instantaneous velocity.

3rd derivative is jerk

Jerk, (sometimes called jolt in brothers English, yet less frequently so, early to feasible confusion through use of the word to additionally mean electric shock), surge or lurch, is the price of adjust of acceleration; much more precisely, the derivative of acceleration v respect to time, the 2nd derivative the velocity, or the 3rd derivative that displacement. Jerk is described by the following equation:
is acceleration,
– velocity,
– position
means time.

4th derivative is jounce

Jounce (also well-known as snap) is the 4th derivative that the place vector v respect come time, v the first, second, and 3rd derivatives gift velocity, acceleration, and jerk, respectively; in various other words, jounce is the rate of change of the jerk through respect come time.

5th and beyond: Higher-order derivatives

Following jounce (snap), the fifth and sixth derivatives of the displacement vector are sometimes referred to as crackle and pop, respectively. The seventh and also eighth derivatives of the displacement vector are occasionally referred to together lock and also drop.

-1st derivative (integral) of position is absement


Theblue curve represents absement. The slope of the blue curve, at aparticular point, denotes position. Thus if the blue line denotedquantity that water in a reservoir where flow was dicated linearly bydisplacement of a regulate valve, the steep of the eco-friendly line would givethe position of the control valve at that suggest in time.
Absement (or absition) describes the -1th time-derivative of displacement (or position), i.e. The integral of place over time.The rate of readjust of absement is position. Absement is a amount with measurement length*time. In SI units, absement is measure in metre seconds (m·s).One meter-second corresponds to being lacking from anorigin or various other reference suggest for a expression of one second. Thisamount the absement is equal to being 2 metres away from the originfor one half second, or being one fifty percent a metre from the beginning for twoseconds, or a 1mm absence for 1000 seconds, a 1km absence for 1millisecond, etc..The native "absement" is a blend of the words absence and displacement.

Useful applications of absement

Whereas many musical keyboard instruments, such together the piano,and many electronic keyboards, respond to velocity at which tricks arestruck, and some such together the tracker-organ, respond to displacement(how much down a crucial is pressed), flow-based musical tools such asthe hydraulophone,respond come the integral that displacement, i.e. Come a time-distanceproduct. For this reason "pressing" a crucial (water jet) ~ above a hydraulophone down fora longer period of time will an outcome in a buildup that the sound level, asfluid (water) begins to fill the sounding mechanism (reservoir), up toa details maximum filling allude beyond which the sound levels off(along with a slow decay). Hydraulophone reservoirs have actually an approximateintegrating result on the street or displacement applied by themusician"s fingers to the "keys" (water jets). Vice versa, the pianoprovides an ext articulation and enunciation of separation, personal, instance note-onsetsthan the organ, the hydraulophone gives a an ext continuously fluidlyvarying sound 보다 either the body organ or piano.Of course all these models room approximate: hydraulophones areapproximately presement-responsive, pianos space approximatelyvelocity-responsive, etc..The principles of absement and presement originated in regardsto flow-based musical tools like hydraulophones, but may beapplied to any type of area of physics, as they exist along the pecking order ofthe derivatives of displacement.A an extremely slow-responding pipe-organ with tracker-action canoften exhibition an effect similar to the of a hydraulophone, as soon as ittakes time because that the wind and also sound levels to build up, so the the soundlevel is approximately the product that how much down a key is pressed andhow long it is held down for.

Exampleto show the concept of absement: think about a 5-hour train ridethat takes girlfriend 500 miles directly from her home, in a directly line,where you continue to be for 5 hours and then return. Intend you want to staylogged right into your home computer system at a communications cost of$1/mile/hour(where "mile" is the distance between your existing positionand your home). The total cost of her online interactions is $5000,since the absement (time-integral the displacement) is 5000 mile hours(1250 mile hrs on the means to her destination, plus 500 miles * 5hours remain = 2500 mile hours, add to 1250 mile hours of absement duringthe return trip).
The ide of absement may additionally be applied to communications theory.For example, the an obstacle in preserving a interactions channel(wired or wireless) increases with distance and also with the time for which the channel should be preserved active.As a crude oil but simple example, absement might be used, veryapproximately, to model the price of a long-distance phone call as theproduct that distance and also time. A short-duration speak to over a longdistance might, because that example, stand for the same quantity of absement asa long-duration speak to over a shorter distance.Absement may also be supplied in sociological studies, i.e. Wemight express loneliness or homesickness together a product of street fromhome and time far from home. Simply put, the old aphorism "absencemakes the heart grow fonder" has actually been expressed together "absement makes theheart grow fonder"<1>, to suggest that it matters both how missing oneis (i.e. Exactly how far), and for exactly how long one is absent.

Absement versus presement

Absement refers to the time-distanceproduct (or an ext precisely the integral the displacement) far from areference point, vice versa, the integral of mutual position, calledpresement, refers to the closeness, compounded gradually <1>.The word "presement" is a portmanteau built from the indigenous presence and displacement.Placement (scalar quantity, nearness) is identified as thereciprocal of place (scalar quantity distance), and presement refersto the time-integral the placement. Most notably, through somehigh-pressure hydraulophones, the is physically impossible to fullyobstruct a water jet, therefore position can never reach zero <1>, and thusplacement continues to be finite, as does the time integral, presement.Simply put, absement is the time-integral the farness, andpresement is the time-integral the nearness, to a given allude (e.g.farness or nearness that a musician finger to/from the leave port that awater jet in a hydraulophone).

Lower-order derivatives (higher-order integrals) of position

Somehydraulophones, such as the north Nessie (the hydraulophone top top theNorth side of hydraulophone circle) at the Ontario science Centreconsist of cascaded hydraulophonic mechanisms, resulting in adouble-integrating effect. In particular, the hydraulophone is linkedindirectly come the north pipes, such that the water in straight physicalcontact with the fingers of the musician is not the very same water in theorgan pipes. Together a an outcome of this indirection, the tool itselfresponds come presement/absement, the very first integral of place whereasthe tube respond absemently come the activity in the instrument, i.e. Tothe 2nd integral of position of the player"s fingers. Thetime-integral the the time-integral of place is calledabsity/presity.Absity is a portmanteau developed from the words absement (or absence) and also velocity.Following this pattern, higher integrals that displacement may be called as follows:Absement is the integral of displacement;Absity is the dual integral the displacement;Abseleration is the triple integral the displacement;Abserk is the fourth integral that displacement;Absounce is the 5th integral of displacement, and so on...Likewise, Presement, Presity, Preseleration, etc., are the integrals of mutual displacement (nearness).Although there room no three-stage hydraulophones currentlybeing produced as products, there room a variety of three-stage (andsome with higher numbers the stages) hydraulophone prototypes, in whichsome elements of the sound production respond to absity/presity,abseleration/preseleration, etc..


The complying with table is a summary of the derivatives that position:derivativeterminologySI unitmeaning
-5absouncem·s5time integral that abserk
-4abserkm·s4time integral the abseleration
-3abselerationm·s³time integral that absity
-2absitym·s²time integral of absement
-1absement (absition)m·stime integral the position
0position (displacement)mposition
1velocitym·s-1rate-of-change the position
2accelerationm·s-2rate of adjust of velocity
3jerkm·s-3rate of change of acceleration
4jounce (snap)m·s-4rate of change of jerk
5cracklem·s-5rate of change of jounce
6popm·s-6rate of readjust of crackle
7lockm·s-7rate of adjust of pop
8dropm·s-8rate of change of lock


<1> What is the term used for the 3rd derivative of position?<2> Steve Mann, Ryan Janzen, Mark short article (2006), "HydraulophoneDesign Considerations: Absement, Displacement, and Velocity-SensitiveMusic key-board in i beg your pardon Each an essential is a Water Jet." ACM Multimedia (MM2006), pp. 519-528, Santa Barbara, CA, Oct. 23-27, 2006.(<1>)<3> Steve Mann, Michael Georgas, Ryan Janzen (2006), "Water jets aspixels: water fountains as both sensors and also displays", Eighth IEEEInternational Symposium top top Multimedia, IEEE ISM2006, pp. 766-772, Dec.11-13, 2006, san Diego, CA.

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<4> Steve Mann, Ryan Janzen, Raymond Lo, kris Aimone (2007),"Inventing brand-new instruments based upon a computational "hack" to make abadly tuned or unpitched tool play in perfect harmony",International computer Music Conference, ICMC2007, Aug. 27-31, 2007,Copenhagen, Denmark.