Foot-pound (energy)

The foot-pound or foot-pound force is a British and US unit of both energy and torque (there also pound-foot). The unit symbol is ft-lb or ft-lbf, also lbf-ft.

One foot-pound is exactly equal to 1.355 817 948 331 400 4 J (joules) and is equal to the energy required to lift a body with a mass of one pound by one foot against its weight force:

{\displaystyle {1\,\mathrm {ft} \cdot \mathrm {lb} =\mathrm {lb} \cdot g\cdot \mathrm {ft} =0{,}45359237\,\mathrm {kg} \cdot 9{,}81\,{\frac {\mathrm {m} }{\mathrm {s} ^{2}}}\cdot 0{,}3048\,\mathrm {m} =1{,}35581\dots \,\mathrm {kg} {\frac {\mathrm {m} ^{2}}{\mathrm {s} ^{2}}}=1{,}355\,817\,948\,331\,400\,4\,\mathrm {J} }}

550 foot-pounds per second equals one hp (about 745.7 watts).


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