Pound-foot (torque)
Template:Short description Script error: No such module "Distinguish". Script error: No such module "Infobox".<templatestyles src="Template:Infobox/styles-images.css" /> A pound-foot (lb⋅ft), abbreviated from pound-force foot (lbf · ft), is a unit of torque representing one pound of force acting at a perpendicular distance of one foot from a pivot point.[1] Conversely one foot pound-force (ft · lbf) is the moment about an axis that applies one pound-force at a radius of one foot.
Unit
The value in Système International (SI) units is given by multiplying the following exact factors:
- One pound (mass) = Script error: No such module "val".[2]
- Standard gravity = 9.80665 m/s2[2]
This gives the exact conversion factor:
- One pound-foot = Script error: No such module "Gaps". newton metres.
The name "pound-foot", intended to minimize confusion with the foot-pound as a unit of work, was apparently first proposed by British physicist Arthur Mason Worthington.[3]
Despite this, in practice torque units are commonly called the foot-pound (denoted as either lb-ft or ft-lb) or the inch-pound (denoted as in-lb).[4][5] Practitioners depend on context and the hyphenated abbreviations to know that these refer to neither energy nor moment of mass (as the symbol ft-lb rather than lbf-ft would imply).
Similarly, an inch-pound (or pound-inch) is the torque of one pound of force applied to one inch of distance from the pivot, and is equal to Template:Cvt. It is commonly used on torque wrenches and torque screwdrivers for setting specific fastener tension. An inch-ounce is a smaller unit, equal to <templatestyles src="Fraction/styles.css" />1⁄16 of an inch-pound.
See also
- Kilogram metre (torque) (kgf⋅m)
References
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- ↑ a b c Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1". In most US industrial settings, the torque ranges are given in ft-lb rather than lbf-ft.
- ↑ Script error: No such module "citation/CS1".
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Template:Imperial units Template:United States Customary Units