Angular Momentum

Resources

• Earth rotation
  • International Earth Rotation and Reference Systems Service (IERS)
    • hpiers.obspm.fr
    • www.iers.org
  • General
    • Rotation of the Earth. Nigel Bunce & Jim Hunt. The Science Corner. No. 42 (1984).
  • Effect of the atmosphere on the Earth's rotation
    • Effect of global mass conservation among geophysical fluidson the seasonal length of day variation. Haoming Yan, Benjamin F. Chao. Journal of Geophysical Research: Solid Earth (1978–2012). Vol. 117 No. B2 (2012).
    • Wind contributions to the Earth's angular momentum budgets in seasonal variation. Yuichi Aoyama, Isao Naito. Journal of Geophysical Research: Atmospheres (1984–2012). Vol. 105 No. D10 (2000): 12417–12431.
    • Temporal variation of the Earth's low-degree zonal gravitational field caused by atmospheric mass redistribution: 1980–1988. B. Fong Chao, Andrew Y. Au. Journal of Geophysical Research: Solid Earth (1978–2012). Vol. 96 No. B4 (1991): 6569–6575.
  • Effect of earthquakes on the Earth's rotation
    • Did the 26 December 2004 Sumatra, Indonesia, Earthquake disrupt the Earth's rotation as the mass media have said? B. Fong Chao, Richard S. Gross. Eos, Transactions American Geophysical Union. Vol. 86 No. 1 (2005): 1–2, 4. "The answer to this question is a definite yes. But then again, the same is true of any earthquake…. The real question should be, Did this particular earthquake disrupt the Earth's rotation to a level large enough to be noticeable, or, technically observable? The answer is a sobering hardly…."
    • The rotational and gravitational signature of the December 26, 2004 Sumatran earthquake. Richard S. Gross, B. Fong Chao. Surveys in Geophysics. Vol. 27 No. 6 (2006): 615–632 (open access copy). The Sumatran earthquake of December 26, 2004 is the largest earthquake to have occurred since the 1960 Chilean earthquake. This earthquake should have caused the length-of-day to decrease by 6.8 microseconds.
    • Changes of the Earth's Rotational Energy Induced by Earthquakes. B. Fong Chao, Richard S. Gross. Geophysical Journal International. Vol. 122 No. 3 (1995): 776–783.
    • Global Gravitational Energy Changes Induced by Earthquakes. B. Fong Chao, Richard S. Gross, Da-Nan Dong. Geophysical Journal International. Vol. 122 No. 3 (1995): 784–789.
    • Changes in the Earth's Rotation and Low-degree Gravitational Field Induced by Earthquakes. B. Fong Chao, Richard S. Gross. Geophysical Journal International. Vol. 91 No. 3 (1987): 569–596. An important, but highly technical, paper.
    • Excitation of the Normal Modes of the Earth by Earthquake Sources. Freeman Gilbert. Geophysical Journal International. Vol. 22 No. 2 (1970): 223–226. The foundations of this field of study.
  • Effect of reservoirs on the Earth's rotation
    • Anthropogenic impact on global geodynamics due to reservoir water impoundment. Benjamin Fong Chao. Geophysical Research Letters. Vol. 22 No. 24 (1995): 3529–3532. "Reservoir water has contributed a significant fraction in the total observed polar drift over the last 40 years."
    • Effect of global mass conservation among geophysical fluids on the seasonal length of day variation. Journal of Geophysical Research. Vol. 117 No. B2 (2012).
  • effects of snow on the Earth's rotation
    • Snow load effect on the Earth's rotation and gravitational field, 1979–1985. B. Fong Chao, William P. O'Connor, Alfred T.C. Chang, Dorothy K. Hall, James L. Foster. Journal of Geophysical Research: Solid Earth (1978–2012). Vol. 92 No. B9 (1987): 9415–9422.
• Origin of the moon
  • Satellite-sized planetesimals and lunar origin. William K. Hartmann, Donald R. Davis. Icarus. Vol. 24 No. 4 (1975): 504–515.
  • The Origin of the Moon. A.G.W. Cameron, W.R. Ward. Lunar Science VII: Abstracts of Papers submitted to the Seventh Lunar Science Conference. Lunar and Planetary Institute, March 15–19, 1976, Houston, Texas. (1976): abstract #1041.
  • The origin of the moon and the single-impact hypothesis I. W. Benz, W.L. Slattery, A.G.W. Cameron. Icarus. Vol. 66 No. (1986): 515–535.
  • The origin of the Moon and the single-impact hypothesis II. W. Benz, W.L. Slattery, A.G.W. Cameron. Icarus. Vol. 71 No. 1 (1987): 30–45.
  • The origin of the Moon and the single-impact hypothesis III. W. Benz, A.G.W. Cameron, H.J. Melosh. Icarus. Vol. 81 No. 1 (1989): 113–131.
  • The origin of the moon and the single impact hypothesis IV. A.G.W. Cameron, W. Benz. Icarus. Vol. 92 No. 2 (1991): 204–216.
  • Origin of the Moon in a giant impact near the end of the Earth's formation. Robin M. Canup, Erik Asphaug. Nature. Vol. 412 No. (2001): 708–712.
  • Making the Moon. David J. Stevenson. Physics Today. Vol. 67 No. 11 (2014): 32–38.
• Sports & fitness
  • DFX Sport & Fitness a.k.a. Dynaflex. Makers of the Dynaflex Gyro wrist exercise ball.
    • Self-generating wrist ball. Hsiu-Min Kuo. US Patent 6,770,012 (2004).
    • Wrist exerciser. P.S. Chuang. US Patent 5,800,311 (1998).
    • Gyroscopic exerciser. Jerrold W. Silkebakken, Bruce H. Hale, Newport Plastics. US Patent 4,150,580 (1979).
• Video on demand
  • Brady Haran
    • Angular Momentum. Sixty Symbols. YouTube (2009). A rather dizzy Professor Bowley sacrifices his well-being in the name of science.
  • The Mechanical Universe and Beyond (1985)
    • Angular Momentum. An old momentum with a new twist.
    • Torques and Gyroscopes. From spinning tops to the precession of the equinoxes
  • Miscellaneous
    • Skylab Toy Gyroscope. A Skylab astronaut uses a toy gyroscope to demonstrate conservation of angular momentum.
    • Slow motion flipping cat physics. Smarter Every Day. Episode 58 (2012).