Kilogram-force From Wikipedia, the free encyclopedia The kilogram-force (kgf or kgF), or kilopond (kp, from Latin pondus meaning weight), is a gravitational metric unit of force. It is equal to the magnitude of the force exerted by one kilogram of mass in a 9.80665 m/s2 gravitational field (standard gravity, a conventional value approximating the average magnitude of gravity on Earth).[1] Therefore one kilogram-force is by definition equal to 9.80665 N.[2][3] Similarly, a gram-force is 9.80665 mN, and a milligram-force is 9.80665 µN. One kilogram-force is approximately 2.204622 pounds-force. Kilogram-force is a non-standard unit and does not comply with the SI Metric System. Contents 1 History 2 Related units 3 See also 4 References 5 External links History The gram-force and kilogram-force were never well-defined units until the CGPM adopted a standard acceleration of gravity of 980.665 cm/s2 for this purpose in 1901, though they had been used in low-precision measurements of force before that time. The kilogram-force has never been a part of the International System of Units (SI), which was introduced in 1960. The SI unit of force is the newton. Prior to this, the unit was widely used in much of the world and it is still in use for some purposes. The thrust of a rocket engine, for example, was measured in kilograms-force in 1940s Germany, in the Soviet Union (where it remained the primary unit for thrust in the Russian space program until at least the late 1980s), and it is still used today in China and sometimes by the European Space Agency. It is also used for tension of bicycle spokes,[4] for informal references to pressure in kilograms per square centimeter (1 kp/cm2) which is the technical atmosphere (at) and very close to 1 bar and the standard atmosphere (atm), for the draw weight of bows in archery, and to define the metric horsepower (PS) as 75 metre-kiloponds per second.[2] Three approaches to metric mass and force units[5][6] v t e Base force, length, time weight, length, time mass, length, time Force (F) F = m·a = w·a/g F = m·a/gc = w·a/g F = m·a = w·a/g Weight (w) w = m·g w = m·g/gc ≈ m w = m·g System GM M CGS MTS SI Acceleration (a) m/s2 m/s2 Gal m/s2 m/s2 Mass (m) hyl kg g t kg Force (F) kp kp dyn sn N Pressure (p) at atm Ba pz Pa Related units The tonne-force, metric ton-force, megagram-force, and megapond (Mp) are each 1000 kilograms-force. The decanewton or dekanewton (daN) is used in some fields as an approximation to the kilogram-force, being exactly rather than approximately 10 newtons. Units of force v t e newton (SI unit) dyne kilogram-force, kilopond pound-force poundal 1 N ≡ 1 kg·m/s2 = 105 dyn ≈ 0.10197 kp ≈ 0.22481 lbF ≈ 7.2330 pdl 1 dyn = 10−5 N ≡ 1 g·cm/s2 ≈ 1.0197 × 10−6 kp ≈ 2.2481 × 10−6 lbF ≈ 7.2330 × 10−5 pdl 1 kp = 9.80665 N = 980665 dyn ≡ gn·(1 kg) ≈ 2.2046 lbF ≈ 70.932 pdl 1 lbF ≈ 4.448222 N ≈ 444822 dyn ≈ 0.45359 kp ≡ gn·(1 lb) ≈ 32.174 pdl 1 pdl ≈ 0.138255 N ≈ 13825 dyn ≈ 0.014098 kp ≈ 0.031081 lbF ≡ 1 lb·ft/s2 The value of gn as used in the official definition of the kilogram-force is used here for all gravitational units. See also Metrology Avoirdupois References Jump up ^ The international system of units (SI) – United States Department of Commerce, NIST Special Publication 330, 2008, p. 52 ^ Jump up to: a b NIST Guide for the Use of the International System of Units (SI) Special Publication 811, (1995) page 51 Jump up ^ BIPM SI brochure, chapter 2.2.2. Jump up ^ Park Tool. Balancing wheel tension with the TM-1 Spoke Tension Meter. Cyclingnews. Retrieved 2013-09-03. The recommended tension for spokes in bicycle wheels can be as low as 80 Kilograms force (Kfg) and as high as 230 Kilograms force. Jump up ^ Michael R. Lindeburg (2011). Civil Engineering Reference Manual for the Pe Exam. Professional Publications. ISBN 1591263417. Jump up ^ Wurbs, Ralph A, Fort Hood Review Sessions for Professional Engineering Exam, retrieved October 26, 2011 External links Measurement of forces by comparison to the kilogram-force unit (video) Categories: Units of force Non-SI metric units Navigation menu Create account Log in Article Talk Read Edit View history Main page Contents Featured content Current events Random article Donate to Wikipedia Wikimedia Shop Interaction Help About Wikipedia Community portal Recent changes Contact page Tools Print/export Languages العربية Asturianu Беларуская (тарашкевіца) Български Bosanski Català Čeština Dansk Deutsch Español Esperanto Français Galego 한국어 Հայերեն Hrvatski Interlingua Italiano Magyar Македонски Nederlands 日本語 Norsk bokmål Norsk nynorsk Polski Português Русский Slovenčina Slovenščina Srpskohrvatski / српскохрватски Suomi Svenska Türkçe Українська 中文 Edit links This page was last modified on 10 February 2014 at 00:30. 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Posted on: Sat, 08 Mar 2014 10:41:30 +0000
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