the point of contra flexure is a point where
Contraflexure In a bending beam, a point is known as a point of contraflexure if it is a location at which no bending occurs. It is also known as an inflection point. In a bending moment diagram, it is the point at which the bending moment curve intersects with the zero line. In other words where the bending moment changes its sign from negative to positive or vice versa. Knowing the place of the contraflexure is especially useful when designing reinforced concrete or structural steel beams and also for designing bridges.
Fault (geology) In a strike-slip fault (also known as a wrench fault, tear fault or transcurrent fault),[7] the fault surface (plane) is usually near vertical and the footwall moves laterally either left or right with very little vertical motion. Strike-slip faults with left-lateral motion are also known as sinistral faults. Those with right-lateral motion are also known as dextral faults.[8] Each is defined by the direction of movement of the ground as would be seen by an observer on the opposite side of the fault.