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The pound of force or pound-force (symbol: lbf, [1] sometimes lb f, [2]) is a unit of force used in some systems of measurement, including English Engineering units [a] and the foot–pound–second system.
25 Αυγ 2015 · In the English system, the force unit is the pound-force ($lbf$) and is defined as the force required to accelerate a mass of $32.174\cdot lbm$ (1 slug) at a rate of $1\cdot\frac{ft}{s^2}$. That is...
It is defined as the force required to accelerate a mass of one pound at a rate of 32.17405 feet per second squared. On the other hand, lbs, or pounds, is a unit of mass or weight. It is commonly used to measure the weight of objects. To convert between lbf and lbs, it is important to note that 1 lbf is equal to 1 pound.
The pound-force, or simply pound (abbreviations: lb, lb f, or lbf), is a unit of force. The pound-force is about equal to the gravitational force applied on a mass of one pound on the surface of Earth. Since the 18th century, the unit has been used in low-precision measurements. In the 20th century, people needed a more precise definition.
In other words, 1 lb f (pound-force) acting on 1 slug of mass will give the mass an acceleration of 1 ft/s 2. The weight (force) of the mass can be calculated from equation (2) in BG units as F g (lb f ) = m (slugs) a g (ft/s 2 )
Pound, unit of avoirdupois weight, equal to 16 ounces, 7,000 grains, or 0.45359237 kg, and of troy and apothecaries’ weight, equal to 12 ounces, 5,760 grains, or 0.3732417216 kg. The Roman ancestor of the modern pound, the libra, is the source of the abbreviation lb.
Pound-force is abbreviated as 'lbf' and is part of the Imperial system of units, primarily used in the United States. In terms of calculations, 1 pound-force is equal to approximately 4.448 newtons in the SI system.
