Force (lb) x speed (ft/min) 33,000. The rate of doing work (transferring energy) equivalent to lifting 33,000 lb 1 ft/min (33,000 ftlb/min). This is also 550 ft-lb/sec. Lifting a weight is a simple example of a force in motion. The same combination of force-timesspeed in any direction along the flat, on a slant, around a curve, or any combination: is the same horsepower. (Also, other transfers of energy may be stated as horsepower). (Bul D10)