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The pound-force is equal to the gravitational force exerted on a mass of one avoirdupois pound on the surface of Earth.Since the 18th century, the unit has been used in low-precision measurements, for which small changes in Earth's gravity (which varies from equator to pole by up to half a percent) can safely be neglected.
5 / 9 k Units for other physical quantities are derived from this set as needed. In English Engineering Units, the pound-mass and the pound-force are distinct base units, and Newton's Second Law of Motion takes the form F = m a g c {\displaystyle F=m{\frac {a}{g_{\mathrm {c} }}}} where a {\displaystyle a} is the acceleration in ft/s 2 ...
See my contributions on pound mass for problems with your arguments. Unfortunately, "In this you are completely wrong Yath. While 5 lb of flour in a grocery store, by defintion is both 5 pounds force as well as 5 pounds mass. The use referred to is force. The "legal" basis that you refer to I would like you to quote specifically from law text.
The pound-force provides an alternative unit of mass: one slug is the mass that will accelerate by one foot per second squared when acted on by one pound-force. [58] An alternative unit of force in a different foot–pound–second system, the absolute fps system, is the poundal , defined as the force required to accelerate a one-pound mass at ...
Gravitational "weight" is the force created when a mass is acted upon by a gravitational field and the object is not allowed to free-fall, but is supported or retarded by a mechanical force, such as the surface of a planet. Such a force constitutes weight. [2] This force can be added to by any other kind of force.
Perhaps this is what is causing all the confusion: a pound can be a couple of different things: it can be a unit of force, or a unit of mass. The word pound-force is used to make it explicit that what is being used is the force unit, not the mass unit. The unit of energy is the unit of force times one foot.
newton dyne kilogram-force, kilopond pound-force poundal; 1 N : ≡ 1 kg⋅m/s 2 = 10 5 dyn ≈ 0.101 97 kp: ≈ 0.224 81 lb F: ≈ 7.2330 pdl: 1 dyn = 10 −5 N ≡ 1 g⋅cm/s 2
In United States customary units, the pound can be either a unit of force or a unit of mass. [24] Related units used in some distinct, separate subsystems of units include the poundal and the slug. The poundal is defined as the force necessary to accelerate an object of one-pound mass at 1 ft/s 2, and is equivalent to about 1/32.2 of a pound-force.
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