Footpoundsecond system has two approaches one of which is Force using the British Gravitational system.
The footpoundsecond system or FPS system is a system of units built on three fundamental units: the foot for length, the (avoirdupois) pound for either mass or force (see below), and the second for time. System British Gravitational (BG) English Engineering (EE) Absolute English (AE) 
