Foot-pound (energy)
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The foot-pound force, or simply foot-pound (symbol: ft-lbf or ft-lb) is a unit of work or energy (a scalar).
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[edit] Other units of energy
One foot-pound force is the amount of energy expended when one pound-force acts through a distance of one foot along the direction of the force.
example : If you drop a one pound ball of Lead from one foot off the ground, it will hit the ground with 1 ft-lb of force. Dropping a one pound ball of Lead from 12 feet, it will hit the ground with 12 ft-lb of force or the same energy as a standard UK air rifle.
1 foot-pound force is equivalent to:
- 1.3558179483314 joules
- 13,558,179.483314 ergs
- 12 inch-pound force (exactly)
- 192 inch-ounce force (exactly)
- 0.001285067 British Thermal Units
- 0.323832 calories
- 0.000323832 "food calories," also called kcal or Calorie (capitalized)
[edit] Related units of power
The foot-pound force per minute (ft-lbf/min), foot-pound force per second (ft-lbf/s), and horsepower are imperial units of power derived from the foot-pound force.
- 1 watt ≈ 44.25372896 ft-lbf/min
- 1 horsepower (mechanical) = 33,000 ft-lbf/min = 550 ft-lbf/s
Using the FPS (foot-pound-second) system of measurement a foot-pound is defined as the amount of work required to raise a weight of one pound a distance of one foot.
[edit] See also
[edit] References
- "foot-pound." The Columbia Encyclopedia, Sixth Edition. 2008. Via Encyclopedia.com: defines symbol as "ft-lb". Retrieved 2009-12-05.
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