pound foot/square second Unit Converter

Definition of pound foot/square second unit

The pound foot per square second (lb·ft/s²) is a unit of force in the foot–pound–second absolute system. It represents the force required to accelerate a one-pound mass at one foot per second squared, and is also called the poundal.

History of pound foot/square second unit

The unit emerged from the British gravitational and absolute measurement traditions, which developed alongside the foot, pound, and second. In the absolute foot–pound–second system, engineers needed a coherent force unit derived from mass and acceleration; the poundal was defined accordingly in the nineteenth century. Its name combines “pound” with “-al,” indicating an absolute unit. Later, practical engineering favored pound-force, tied to standard gravity, while scientific work increasingly adopted the newton. Consequently, pound foot per square second is now uncommon, surviving mainly in historical references and specialized discussions of older FPS systems.

Applications of pound foot/square second unit

Today, the unit appears primarily in historical engineering literature, older technical manuals, and conversions involving the poundal. It may be encountered when interpreting pre-SI mechanics, vintage aerospace or ballistics calculations, and educational comparisons between absolute and gravitational FPS systems. Modern engineering generally reports equivalent forces in newtons or pound-force instead.

Complete list of pound foot/square second unit conversion