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Shear force is a load (pounds, or newtons) in plane of the object which produces shear stress ( pounds per sq inch, or Pascals).
Shear force is related to shear stress as
STRESS = FORCE/AREA
The stress that causes strike-slip faults is produced by a shearing force and so is called shear stress.
shearing work
the 3 kinds of stress are compression,tension, and shearing