**Jerk** a vector quantity that specifies time rate of change of acceleration - units m/s^{3}

**Joule : J** the derived SI unit of
Work or
Energy.

A Joule is the work done by a Force of 1 Newton acting through a distance of one metre.

Joule = N·m = Kg·m^{2}/s^{2} = W·s = Pa·m^{3} = 10^{7} ergs = C·V

where kg is the kilogram, m is the metre, s is the second, N is the newton, Pa is the pascal, W is the watt, C is the coulomb, and V is the volt.

**joule per cubic metre : J/m ^{3}** : see Energy Density

**joule per kilogram : J/kg** : see Specific Energy

**joule per second, J/s** : see Sound Power