For surfaces that are perpendicular to one direction, the stress magnitude is greatest, and for surfaces that are parallel to that direction, the stress magnitude is zero.
Stress is the applied force or system of forces that tends to deform a body from the viewpoint of loading. Stress is the internal distribution of forces within a body that balance and respond to the loads given to it from the viewpoint of what is happening inside a material. Stress is a measurement of how a substance reacts to external influences. It is merely a ratio of the material's cross sectional area to the external forces. Stress (S = R/A, where S is the stress) is the ratio of force to area.
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