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Feb 2013

Volume 81, Issue 2, pp. 85-159

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Erratum: “An item response curves analysis of the force concept inventory” [Am. J. Phys. 80, 825–831 (2012)]

Gary A. Morris, Nathan Harshman, Lee Branum-Martin, Eric Mazur, Taha Mzoughi, and Stephen D. Baker

American Journal of Physics -- February 2013 -- Volume 81, Issue 2, pp. 144

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Abstract Unavailable
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99.10.-x Errata and other corrections

Apparent failure of the principle of least action

Jeroen Spandaw

American Journal of Physics -- February 2013 -- Volume 81, Issue 2, pp. 144

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In this note, we show that casual application of the principle of least action leads to the erroneous conclusion that things ought to fall upwards. We will analyze this paradox and show which lesson can be learned from it.
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02.00.00 Mathematical methods in physics

The electric cat: Rotation without net overall spin

Richard D. Kaufman

American Journal of Physics -- February 2013 -- Volume 81, Issue 2, pp. 147

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Two schools of thought have developed regarding the method used by a falling cat to rotate in air: the “legs in–legs out” method and the “tuck and turn” or rotating spine method. Since photographic evidence has not settled the debate, we develop a mathematical model called the “electric cat” to show quantitatively that the first method is not sufficient for a cat's full rotation in air during a safe drop.
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45.00.00 Classical mechanics of discrete systems

Comment on “Pointy ice-drops: How water freezes into a singular shape” [Am. J. Phys. 80, 764–771 (2012)]

Michael Nauenberg

American Journal of Physics -- February 2013 -- Volume 81, Issue 2, pp. 150

Online Publication Date: Jan 2013

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Abstract Unavailable
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64.00.00 Equations of state, phase equilibria, and phase transitions

Response to “Comment on ‘Pointy ice-drops: How water freezes into a singular shape’” [Am. J. Phys. 80, 764–771 (2012)]

Jacco H. Snoeijer and Philippe Brunet

American Journal of Physics -- February 2013 -- Volume 81, Issue 2, pp. 151

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Abstract Unavailable
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64.00.00 Equations of state, phase equilibria, and phase transitions
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