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 ?
"You could see these men taking their last breaths, jerking around, while in the background there were people clapping."
Electro, synth-tastic track Puppet saw the girls perform with ribbons tied to their wrists, jerking around the sparkling set.