jerk

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jerk

[jərk]
(mechanics)
The rate of change of acceleration; it is the third derivative of position with respect to time.
A unit of rate of change of acceleration, equal to 1 foot (30.48 centimeters) per second squared per second.
References in periodicals archive ?
Several months later, he developed intermittent, random, low-amplitude, lightning-like jerking movements of the extremities.
Find your cast-and-retrieve rhythm - a fluid motion of jerking and winding a shiner-imitation lure fortified with three treble hooks - and you'll be into bass soon enough.
For example, as soon as he placed his pince-nez on his nose, he felt compelled to continually readjust its position, occasionally jerking back his head for a better focus.