Final answer:
The statement that strain only occurs in the axial direction is false because strain can also occur in shear or volumetric forms, not just axially.
Step-by-step explanation:
The statement “Strain only occurs in the axial direction” is false. Strain refers to the deformation of material due to an applied force and can occur in axial, shear, or volumetric forms. Axial strain results from a stretch or compression along the length of an object, while shear strain occurs when forces are applied parallel to the surface, causing the material to deform laterally. Volumetric strain is the change in volume of a material under stress.