Slug (mass)

Slug (mass)

The slug is an English unit of mass. It is a mass that accelerates by 1 ft/s² when a force of one pound-force (lbf) is exerted on it. Therefore a slug has a mass of 32.17405 pound-mass or 14.5939 kg.Shigley, Joseph E. and Mischke, Charles R. "Mechanical Engineering Design", Sixth ed. McGraw Hill, 2006. ISBN 0-07-365939-8.] A slug weighs about 32.17405 lb at sea level on Earth.

1 mbox{slug} =1 cfrac{mbox{lbf}cdotmbox{s}^2}{mbox{ft

The slug is part of a subset of coherent units known as the gravitational foot-pound-second system (FPS), one of several such specialized systems of mechanical units developed in the late 19th and the 20th century.

The slug was first used in 1902 by Arthur Mason Worthington (1852–1916) in "Dynamics of Rotation" (OED), but it didn't see any significant use until decades later. A 1928 textbook says: "No name has yet been given to the unit of mass and, in fact, as we have developed the theory of dynamics no name is necessary. Whenever the mass, "m", appears in our formulae, we substitute the ratio of the convenient force-acceleration pair "(w/g)", and measure the mass in lbs. per ft./sec.² or in grams per cm./sec.²".Noel Charlton Little, "College Physics," Charles Scribner’s Sons, 1928, p. 165]

Another name for this unit in early literature is the geepound.

The unit slinch (derived from the words slug-inch [ [http://users.aol.com/JackProot/met/spmisc.html Miscellaneous] ] ) is an inch version of the slug (1 slinch = 1 lbf·s²/in = 12 slugs). [ [http://www.diracdelta.co.uk/science/source/s/l/slug/source.html Slug - DiracDelta Science & Engineering Encyclopedia] ] The unit blob (bl) is also an inch version of the slug (1 lbf·s²/in). [Robert L. Norton, Worcester Polytechnic Institute, "Machine Design: An Integrated Approach", Third Edition, Prentice Hall ISBN 0-13-048190-8 ]

Source: "Mechanical Measurements"Beckwith, Thomas G., Marangoni, Roy D., et al. "Mechanical Measurements", Fifth ed. Addison-Wesley Publishing, 1993. ISBN 0-201-56947-7.]

References

External links

* [http://et.nmsu.edu/~etti/winter98/education/gohmann/slug.html Newtons, Slugs and Kilograms Force] for a detailed mathematical explanation
* [http://www.imperialtometric.com/conversion_en.htm Online unit converter]


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Slug (disambiguation) — Slugs are gastropod mollusks without shells or with very small internal shells.Slug may also refer to: * Slug (mass), an English unit of mass * Slug test, a particular type of aquifer test * Slug (production), a short name given to products that… …   Wikipedia

  • slug — slug1 [slug] n. [ME slugge, slow, clumsy person or thing < Scand, as in Swed dial. slogga, to be sluggish < IE base * (s)leu , to hang loosely, lax > SLUDGE] 1. any of a large number of small, gastropod mollusks, esp. the ones resembling …   English World dictionary

  • Mass flow rate — is the mass of substance which passes through a given surface per unit time. Its unit is mass divided by time, so kilogram per second in SI units, and slug per second or pound per second in US customary units. It is usually represented by the… …   Wikipedia

  • slug —    a unit of mass in the English foot pound second system. One slug is the mass accelerated at 1 foot per second per second by a force of 1 pound. Since the acceleration of gravity (g) in English units is 32.174 04 feet per second per second, the …   Dictionary of units of measurement

  • slug — slug1 sluglike, adj. /slug/, n., v., slugged, slugging. n. 1. any of various snaillike terrestrial gastropods having no shell or only a rudimentary one, feeding on plants and a pest of leafy garden crops. 2. a nudibranch. 3. a metal disk used as… …   Universalium

  • slug — I. noun Etymology: Middle English slugge, of Scandinavian origin; akin to Norwegian dialect slugga to walk sluggishly Date: 15th century 1. sluggard 2. a lump, disk, or cylinder of material (as plastic or metal): as a. (1) a musket ball (2)… …   New Collegiate Dictionary

  • Slug (comics) — Superherobox| caption= comic color=background:#ff8080 character name=Slug real name=Ulysses X. Lugman species=Human Mutant publisher=Marvel Comics debut= Captain America #325 (Jan 1987) creators=Mark Gruenwald and Paul Neary alliance… …   Wikipedia

  • slug — I. /slʌg / (say slug) noun 1. any of various slimy, elongated terrestrial gastropods related to the terrestrial snails, but having no shell or only a rudimentary one. 2. a slow moving animal, vehicle, or the like. 3. any heavy piece of crude… …  

  • slug — I [[t]slʌg[/t]] n. v. slugged, slug•ging 1) ivt any of various snaillike terrestrial gastropod mollusks having no shell or only a rudimentary one, feeding on plants, and often a pest of leafy garden crops 2) a metal disk used as a coin or token,… …   From formal English to slang

  • Mass — This article is about the scientific concept. For the substance of which all physical objects consist, see Matter. For other uses, see Mass (disambiguation). Classical mechanics …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”