Jerk

Jerk or the Jerk may refer to:

Titled works:

Other:

See also

Jerk (play)

Jerk is a one-person puppet play by the American writer Dennis Cooper, made in collaboration with director Gisèle Vienne and performer Jonathan Capdevielle, based on Cooper's 1993 novel of the same name. It is based on the story of serial killer Dean Corll and his teenage accomplices David Brooks and Elmer Wayne Henley. The play develops the conceit that Brooks has learnt puppetry in prison and, as part of his rehabilitation, acts out the murders in which he participated via the use of glove puppets and ventriloquism. The performance also involved sections in which the audience read about the murders in pamphlets, entitled "Two Texts for a Puppet Play by David Brooks" that were distributed.

The production premiered on 5 March 2008 in Brest, France. The play was also performed in an English-language version at the South London Gallery as part of the Paris Calling season of performing arts, opening on 1 July 2009. Its performance included music by Peter Rehberg.

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Jerk (physics)

In physics, jerk, also known as jolt, surge, or lurch, is the rate of change of acceleration; that is, the derivative of acceleration with respect to time, and as such the second derivative of velocity, or the third derivative of position. Jerk is defined by any of the following equivalent expressions:

where

Jerk is a vector, and there is no generally used term to describe its scalar magnitude (more precisely, its norm, e.g. "speed" as the norm of the velocity vector).

According to the result of dimensional analysis of jerk, [length/time³], the SI units are m/s³ (or m·s⁻³). There is no universal agreement on the symbol for jerk, but is commonly used. Newton's notation for the time derivative () is also applied.

The fourth derivative of position, equivalent to the first derivative of jerk, is jounce.

Because of involving third derivatives, in mathematics differential equations of the form

are called jerk equations. It has been shown that a jerk equation, which is equivalent to a system of three first order, ordinary, non-linear differential equations, is in a certain sense the minimal setting for solutions showing chaotic behaviour. This motivates mathematical interest in jerk systems. Systems involving a fourth or higher derivative are accordingly called hyperjerk systems.