#resistance.mechanical_phenomenon  any mechanical force that tends to retard or oppose motion
  supertype:  mechanical_phenomenon  a physical phenomenon associated with the equilibrium or motion of objects
  subtype:  friction__rubbing  the resistance encountered when one body is moved in contact with another
     subtype:  abrasion__grinding__attrition__detrition  the wearing down of rock particles by friction due to water or wind or ice
     subtype:  adhesive_friction__grip__traction  the friction between a body and the surface on which it moves (as between an automobile tire and the road)
  subtype:  acoustic_resistance__acoustic_impedance__acoustic_reactance  opposition to the flow of sound through a surface; acoustic resistance is the real component of acoustic impedance and acoustic reactance is the imaginary component
  subtype:  retarding_force__retardingforce__drag  the phenomenon of resistance to motion through a fluid
     subtype:  sonic_barrier__sonicbarrier__sound_barrier__soundbarrier  the increase in aerodynamic drag as an airplane approaches the speed of sound
     subtype:  windage.retarding_force  the retarding force of air friction on a moving object

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