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With standard gravity gc = 9.80665 m/s2, the international foot of 0.3048 m and the avoirdupois pound of 0.45359237 kg, one slug therefore has a mass of approximately 32.17405 lbm or 14.593903 kg. At the surface of the Earth, an object with a mass of 1 slug exerts a force of about 32.17 lbF or 143 N.
The slug is part of a subset of units known as the gravitational FPS system, one of several such specialized systems of mechanical units developed in the late 19th and the 20th century. Geepound was another name for this unit in early literature.The name "slug", as a unit of inertia, was coined before 1900 by British physicist Arthur Mason Worthington, but it did not 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.
|force, length, time||weight, length, time||mass, length, time|
|Force (F)||F = m·a = w·a||F = m·a = w·a||F = m·a = w·a|
|Weight (w)||w = m·g||w = m·g ≈ m||w = m·g|
|Mass (m)||slug||hyl, also called “metric slug” or “TME”||lbm||kg||lb||g||t||kg|
The slug is listed in the "Regulations under the Weights and Measures (National Standards) Act, 1960". This regulation defines the units of weights and measures, both regular and metric, in Australia.
Similar units Edit
- ↑ Shigley, Joseph E. and Mischke, Charles R. Mechanical Engineering Design, Sixth ed, pp. 18–19. McGraw Hill, 2006. ISBN 0-07-365939-8.
- ↑ Shevell, R.S. Fundamentals of Flight, 2nd ed, p. xix. Prentice-Hall, 1989.
- ↑ Beckwith, Thomas G., Roy D. Marangoni, et al. Mechanical Measurements, Fifth ed, pp. 34-36. Addison-Wesley Publishing, 1993. ISBN 0-201-56947-7.
- ↑ . unit2unit.eu
- ↑ Worthington, Arthur Mason (1900). Dynamics of Rotation: An Elementary Introduction to Rigid Dynamics (3rd ed.). Longmans, Green, and Co.. p. 9. http://www.archive.org/stream/dynamicsofrotati00wortuoft#page/8/mode/2up.
- ↑ Lindeburg, Michael, Civil Engineering Reference Manual for the PE Exam
- ↑ Wurbs, Ralph A, Fort Hood Review Sessions for Professional Engineering Exam, http://engineeringregistration.tamu.edu/tapedreviews/Fluids-PE/PDF/Fluids-PE.pdf, retrieved October 26, 2011
- ↑ Miscellaneous
- ↑ Slug - DiracDelta Science & Engineering Encyclopedia
- ↑ Celmer, Robert. Notes to Accompany Vibrations II. Version 2.2. 2009.
- ↑ "1 blob". Wolfram Alpha Computational Knowledge Engine. http://www.wolframalpha.com/input/?i=1+blob&lk=1. Retrieved 27 October 2011.
- ↑ Cardarelli, François (1999). Scientific Units, Weights and Measures. Springer. pp. 358, 377. ISBN 185233682X.