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 ?
Most striking are the moments when Hemingway captures a particular life teetering on or dragged to the verge, such as the horse "cantering jerkily along the barrera.
They say I coast to junctions, don't use the pull-push steering technique, speed, change gears jerkily and don't use my mirrors enough - to list just a few.
The visuals are so polished and shiny that the characters lack the personality of their jerkily animated former selves.
Sometimes bats, their scalloped wings like kindergarten cut-outs, would flutter jerkily in spirals above our heads, then suddenly swoop down, almost touching our hair.
The jerkily animated ruthless pirate could be raising the Jolly Roger once more and mooring the Black Pig at Middlehaven alongside that matchday stripperama the Tuxedo Royale and new boy Mark Viduka's posh yacht.
Crosscuts were made; a tape was applied and jerkily removed.
Another Entablature awardee, the Stoss landscape and urbanism site, has this demented line of tiny blue italic type that runs across the middle of the page from left to right, so jerkily that no-one here could at first read more than the odd word--which, after much scrutiny, combined to suggest that 'Stoss' probably means something like 'a kick in the pants'.
Sometimes you do it jerkily, like a robot, or you can move fluidly, almost as if you have no bones.
Still unaware of our near miss she jerkily makes her way on to the busy roundabout in West London, taking up two lanes.
In fact, her condition is not obvious, until you see her wringing her hands together, her body moving jerkily.
He repeated the word while he rubbed the carpet, white foam appeared under the towel and colored the spot bright green, and whatever in Waterhouse wasn't bone waggled, and from his hair, which he wore long in front and combed over a bald spot in back, a strand dislodged, fell across his face, and swung jerkily back and forth, rhythmically, like an orchestra conductor.
Drive gently - don't accelerate harshly or change gears too jerkily.