- past participle
- present participle
jerk, dork (noun)
a dull stupid fatuous person
jerk, jerking, jolt, saccade (noun)
an abrupt spasmodic movement
(mechanics) the rate of change of acceleration
jerky, jerked meat, jerk (noun)
meat (especially beef) cut in strips and dried in the sun
raising a weight from shoulder height to above the head by straightening the arms
tug, jerk (verb)
a sudden abrupt pull
yank, jerk (verb)
pull, or move with a sudden movement
"He turned the handle and jerked the door open"
jerk, twitch (verb)
move with abrupt, seemingly uncontrolled motions
"The patient's legs were jerkings"
twitch, jerk (verb)
make an uncontrolled, short, jerky motion
"his face is twitching"
buck, jerk, hitch (verb)
jump vertically, with legs stiff and back arched
"the yung filly bucked"
jerk, flick (verb)
throw or toss with a quick motion
"flick a piece of paper across the table"; "jerk his head"
In physics, jerk, also known as jolt, surge, or lurch, is the rate of change of acceleration; that is, the derivative of acceleration with respect to time, the second derivative of velocity, or the third derivative of position. Jerk is defined by any of the following equivalent expressions: where Jerk is a vector, and there is no generally used term to describe its scalar magnitude. The SI units of jerk are metres per second cubed. There is no universal agreement on the symbol for jerk, but j is commonly used. Newton's notation for the derivative of acceleration can also be used, especially when "surge" or "lurch" is used instead of "jerk" or "jolt". If acceleration can be felt by a body as the force exerted by the object bringing about the acceleration on the body, jerk can be felt as the change in this pressure. For example a passenger in an accelerating vehicle with zero jerk will feel a constant force from the seat on his or her body; whereas positive jerk will be felt as increasing force on the body, and negative jerk as decreasing force on the body.