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Strength | strengthunits – Specifies the acceleration force measured in scene units/sec^2.
Drag | drag – Specifies – Specifies a value between 0 and 1 to determine how much of the existing velocity will be negated over the a period of 1 second. The bigger higher the drag, the more the fluid behavior is suppressed and suppressed and the less the less the fluid features are pronounced. A value of 1.0 stops would completely stop the motion of the fluid's motion.
Maximum Distance (units) | maxdistunits – Specifies the distance to the helper icon at which the force completely disappearsAllows you to limit the effect of the force to a box centered around the helper icon. The box is oriented along the Plain Force's arrow and extends infinitely to the sides, while the thickness of the box is represented by the Max Distance option. In case Apply Force Behind Icon is enabled, then the box's thickness doubles as the force would be applied behind the helper icon as well.
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Here are the affected areas with Maximum Distance values of 30, 40, and 50 with a rotated Plain Force and enabled Apply Force Behind Icon option.
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Fade Start | fadestart – Specifies the relative distance (as part of the Maximum Distance) where the force starts to gradually decline. – This is a fraction between 0.0 and 1.0 of the Maximum Distance option and specifies the relative distance where the force starts to gradually decline. If set to 1, the force does not decline at all and just abruptly quits as it reaches the Maximum Distance. If set to 0, then the force starts declining right from the beginning and gradually stops working as the distance reaches Maximum Distance.
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Here is the difference between Fade Start values of 0.0, 0.5, and 1.0.
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Affect | affect – Specifies the affected components of the simulation separated by commas. The supported elements are:
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Apply Force Behind Icon | applyforcebehind – When – When enabled, the force will be applied behind the helper icon as well. If this is turned off, the force would be applied to all voxels or particles of the simulation, as long as the voxel or particle is in the range of the Maximum Distance option.
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Here is the difference when the Apply Force Behind Icon option is disabled and enabled.
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Terminal velocity – The velocity at which the acceleration caused by the force (Strength) is equal to the deceleration caused by the drag.