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Jackhammer
  Rock breaking pneumatic hammer or rock drill.
 
Jaw crusher
  A compression type crusher with consists of two metal plates that crush material as they close together. Typically used in primary crushing as a means of preparing rocks for subsequent crushing stages.
 
Joule (J)
  1.  A unit of energy equal to the work done when a force of one newton acts through a distance
     of one metre.  One joule is equivalent to one watt second or 0.737 foot pounds.
2.  A unit of electrical energy equal to the work done when a current of one ampere is passed
     through a resistance of one ohm for one second.
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