      PF::Acceleration    C:\Users\KatachiHome\AppData\Roaming\MAXON\CINEMA 4D R13_05DFD2A0\plugins\DPIT Plants & Effex 2.0\res\help\EN\Effex\fx_pforce_acceleration.html    +               default.tif                  Object Header   The acceleration force is used with particles only (linked in the Particle Group::Forces list).
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It allows to emit an acceleration per particle and is more direct than the grid external force as well because 
particles can be anywhere in space while a grid only stores data at uniform locations in space.
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It is the prefered way in liquid simulations to introduce gravity because as you may remember from physics
gravity is an acceleration constant. 