Jerk
Jerk :
A name sometimes used by engineers for the rate of change in the acceleration of an object. This is not as silly as it might sound, because when we're in a vehicle and feel a jerk, we are in fact experiencing a change in the acceleration of the vehicle. The term has also been used as a unit of rate of change in acceleration equal to a change in acceleration of one foot per second per second in one second, that is, 1 ft/sec3. In this usage, one jerk equals 0.3048 m/s3 or about 0.03108g/sec
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