# Dictionary Definition

jounce n : a sudden impact; "the door closed with
a jolt" [syn: jolt,
jar] v : move up and down
repeatedly [syn: bounce]

# User Contributed Dictionary

## English

### Derived terms

### Noun

# Extensive Definition

In physics, snap, also referred to
as jounce and various other words, is the fourth derivative of the displacement
vector with respect to time, with the first, second, and
third derivatives being velocity, acceleration, and jerk, respectively; in other words,
the snap is the rate of change of the jerk with respect to
time.

Currently, there are no well accepted
designations for the derivatives of snap. The fifth and sixth
derivatives of displacement as a function of time are "sometimes
somewhat facetiously" referred to as "Crackle"
and "Pop"; however, these terms have not gained widespread
acceptance.

## References

## External links

- Cosmography: cosmology without the Einstein equations, Matt Visser, School of Mathematics, Statistics and Computer Science, Victoria University of Wellington, 2004.
- What is the term used for the third derivative of position?

jounce in French: Snap (physique)

jounce in Polish: Udar (fizyka)