Damping Factor - Toggle linear and/or angular damping, and set a separate damping value for each.
Linear - Defines the slowdown factor for linear particle movement, affecting particle speed.
Angular - Defines the slowdown factor for angular particle movement, affecting particle spin.
Example 1: PhysXDrag_DampingFactor_Linear.zip
Example 2: PhysXDrag_DampingFactor_Angular.zip