the rate at which an object's acceleration changes with respect to time

In physics, jerk (also known as jolt) is the rate at which an object's acceleration changes with respect to time.

as the third derivative of the position function of an object

In physics, particularly kinematics, jerk is defined as the third derivative of the position function of an object.

vector quantity

Jerk is a vector quantity (magnitude and direction), and can be expressed in m/s3 (in SI units) or in standard gravities per second (g/s).

derivative (rate of change) of acceleration

Jerk is the derivative (rate of change) of acceleration.

The rate of change of acceleration, the third derivative of displacement

The rate of change of acceleration, the third derivative of displacement is known as jerk.

an involuntary, unconscious reaction to threatening stimuli

In most cases a jerk is an involuntary, unconscious reaction to threatening stimuli.

the third-order derivative of a variable with respect to time –

A “jerk”, in this context, is the third-order derivative of a variable with respect to time – accordingly, the circuit uses three RC integrators to implement the circuit's differential equation, along with a diode to provide nonlinearity.

a relatively sudden change

Each jerk is a relatively sudden change (spread over a period of a few months to a couple of years) in the A coefficient of this formula, which determines the second derivative; and usually in B and C coefficients as well.

a process

you’ve been misled: jerk is a process, not a flavor.

the tetanic contraction of the muscle suddenly

Jerk refers to the tetanic contraction of the muscle suddenly.

someone who’s being difficult on purpose

A jerk is someone who’s being difficult on purpose.

a sudden jolt of the body

‘jerk’s a sudden jolt of the body which often wakes a person up.

to a maximum deviation of a resultant acceleration that can show the change in acceleration

A “jerk” can correspond to a maximum deviation of a resultant acceleration that can show the change in acceleration.

a small movement of feet

a Jerk is simple and requires a small movement of feet.

an Olympic weightlifting move ( the first place my mind went, obviously) or a sharp sudden movement (hence the name for the weightlifting move

A JERK is an Olympic weightlifting move (the first place my mind went, obviously) or a sharp sudden movement (hence the name for the weightlifting move)

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A jerk is somebody who has a significant or serious problem area with their personality and has no intention of altering A jerk .

someone , who drives slower than youan asshole someone who drives faster

I'm always reminded of George Carlin's definition of the difference between a jerk and and asshole: a jerk is someone who drives slower than you, an asshole someone who drives faster.

This very high change in acceleration

This very high change in acceleration is called 'jerk' by physicists but Marlin's meaning of the word 'jerk' is different.

a dip/quarter squat

A jerk is a dip/quarter squat, you want to try and knee jerk to bring the weight up as high as possible with the first dip, then dip under.

a golf shot with a straight trajectory

A jerk is a golf shot with a straight trajectory but the final lie is left or right from the hole and therefore the golf ball doesn't hole out.