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 ?
Wendy's corpse is first spotted near a river, jerkily rising and falling as if pushed from within, her marionette-like spasms brilliantly choreographed and executed in a postmortem revival witnessed only by a spooked German shepherd.
The car was riding jerkily in low gear over the rough track which was our farm road.
This time housemates were more aware of what they were in for, plus we could watch them walk into the house live, albeit slowly and jerkily, thanks to new invention the internet.
In town, the diddy two-seater still struggles in auto, switching cogs laboriously and sometimes jerkily, but somehow this passes you by when you''re in nose-to-tail crush hour.
In each scene, the actors appeared backlit and silhouetted in the doorway, and moved stiffly and jerkily, like marionettes.
The following evening, I accidentally spied a pair of young, forkhorn bucks jerkily making their way toward my position at the edge of a fern-blanketed bench, possessing an air of interminable vigilance and knowing.
The leaf litter crackles under my feet--the monsoon is still several months away, and the ground is bone dry--as a well-camouflaged butterfly materialises beside me, jerkily flits a few metres away and then disappears once more.
The pupil laughs jerkily and moves to scratch his right ear and then the left.
He's not even 18 hours old, but he's already cantering jerkily about, practising being a racehorse, following the impulse engendered down the ages.
He began to pick up splattered tomatoes he had lost from his cart, picking them up jerkily, and putting them into plastic bags, quickly.
And he has to, for the longer he is fastened to them, the longer English rugby will remain a wooden figure being jerkily pulled by incompetent puppeteers.
It was impossible to express his recollections in words--there simply were no grown-up words for his childish impression--and if he ever related anything, then he did so jerkily and unwillingly--rapidly sketching the outlines and marking a complex move, rich in possibilities, with just a letter and a number.