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The foot-pound force (symbol: ft⋅lbf, [1] ft⋅lb f, [2] or ft⋅lb [3]) is a unit of work or energy in the engineering and gravitational systems in United States customary and imperial units of measure. It is the energy transferred upon applying a force of one pound-force (lbf) through a linear displacement of one foot.
The pound-force is the product of one avoirdupois pound (exactly 0.45359237 kg) and the standard acceleration due to gravity, approximately 32.174049 ft/s 2 (9.80665 m/s 2). [ 5 ] [ 6 ] [ 7 ] The standard values of acceleration of the standard gravitational field ( g n ) and the international avoirdupois pound (lb) result in a pound-force equal ...
25,031 to 25,160 ft⋅pdl (foot-poundal) 778.2 ft⋅lbf (foot-pounds-force) 5.40395 (lbf/in 2)⋅ft 3; A Btu can be approximated as the heat produced by burning a single wooden kitchen match or as the amount of energy it takes to lift a one-pound (0.45 kg) weight 778 feet (237 m). [16]
Conversions between units in the metric system are defined by their prefixes ... = 10 −7 J foot-pound force: ft lbf ≡ g 0 × 1 lb × 1 ft = 1.355 817 948 331 4004 J:
The British imperial units and U.S. customary units for both energy and work include the foot-pound force (1.3558 J), the British thermal unit (BTU) which has various values in the region of 1055 J, the horsepower-hour (2.6845 MJ), and the gasoline gallon equivalent (about 120 MJ). Log-base-10 of the ratios between various measures of energy
1.0 scy [convert: unknown unit] cuydatm [convert: unknown unit] cuydatm (none) standard cubic foot: scf (scfoot) scf long code "scfoot and cufootatm" outputs standard cubic foot and cubic foot of atmosphere respectively (and never feet) 1.0 scf (2.9 kJ) cuftatm [convert: unknown unit] cuftatm (cufootatm) (none) impgalatm [convert: unknown unit ...
For example, in Denmark rifle ammunition used for hunting the largest types of game there such as red deer must have a kinetic energy E 100 (i.e.: at 100 m (110 yd) range) of at least 2,700 J (2,000 ft⋅lbf) and a bullet mass of at least 9 g (140 gr) or alternatively an E 100 of at least 2,000 J (1,500 ft⋅lbf) and a bullet mass of at least ...
In particular Joule had experimented on the amount of mechanical work generated by friction needed to raise the temperature of a pound of water by one degree Fahrenheit and found a consistent value of 778.24 foot pound force (4.1550 J·cal −1).