#stress  (physics) force that produces strain on a physical body
  supertype:  #force  the physical influence that produces a change in a physical quantity; "force equals mass times acceleration"
  subtype:  #tension.stress  (physics) a stress that produces an elongation of an elastic physical body; "the direction of maximum tension moves asymptotically toward the direction of the shear"
  subtype:  #breaking_point  the degree of tension or stress at which something breaks

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