<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1870-3542</journal-id>
<journal-title><![CDATA[Revista mexicana de física E]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fís. E]]></abbrev-journal-title>
<issn>1870-3542</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-35422011000200001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Comentario sobre el artículo "Separación de variables en la ecuación cinemática v² = v²0 + 2&#8594;a·&#948;&#8594;r y su importancia" de los autores S. Díaz-Solórzano y L.A. Gonzalez-Díaz [Rev. Mex. Fís. 56,141-143 (2010)]]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Simón Bolívar Departamento de Física ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<volume>57</volume>
<numero>2</numero>
<fpage>119</fpage>
<lpage>120</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-35422011000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-35422011000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-35422011000200001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se presenta un comentario señalando el uso errado de la idea de separación de variable en la deducción de una importante ecuación de la cinemática de partículas. Igualmente, acotamos la presencia de errores conceptuales en la utilización de tal ecuación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[We comment on a wrong application of the separation of variable idea as applied to derive an important equation of the cinematic of particles. We also point out conceptual errors on how the pointed equation should be applied.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Investigaciones en la enseñanza de la física]]></kwd>
<kwd lng="es"><![CDATA[matemática en física]]></kwd>
<kwd lng="es"><![CDATA[resolución de problemas en física]]></kwd>
<kwd lng="es"><![CDATA[razonamiento cuantitativo]]></kwd>
<kwd lng="en"><![CDATA[Physics education research]]></kwd>
<kwd lng="en"><![CDATA[mathematics in physics]]></kwd>
<kwd lng="en"><![CDATA[physics problem solving]]></kwd>
<kwd lng="en"><![CDATA[quantitative reasoning]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Comentarios</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Comentario sobre el art&iacute;culo "Separaci&oacute;n de variables en la ecuaci&oacute;n cinem&aacute;tica </b>v<sup>2</sup> = v<sup>2</sup><sub>0</sub> + 2<sup>&#8594;</sup>a&#183;&#948;<sup>&#8594;</sup>r<b> y su importancia" de los autores S. D&iacute;az&#150;Sol&oacute;rzano y L.A. Gonzalez&#150;D&iacute;az &#91;Rev. Mex. F&iacute;s. 56,141&#150;143 (2010)&#93;</b></font></p>      <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>S. Rojas*</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Departamento de F&iacute;sica, Universidad Sim&oacute;n Bol&iacute;var, Venezuela, e&#150;mail:</i> <a href="mailto:srojas@usb.ve">srojas@usb.ve</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Recibido el 23 de febrero de 2011.    ]]></body>
<body><![CDATA[<br> 	Aceptado el 7 de junio de 2011.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se presenta un comentario se&ntilde;alando el uso errado de la idea de separaci&oacute;n de variable en la deducci&oacute;n de una importante ecuaci&oacute;n de la cinem&aacute;tica de part&iacute;culas. Igualmente, acotamos la presencia de errores conceptuales en la utilizaci&oacute;n de tal ecuaci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Investigaciones en la ense&ntilde;anza de la f&iacute;sica; matem&aacute;tica en f&iacute;sica; resoluci&oacute;n de problemas en f&iacute;sica; razonamiento cuantitativo.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">We comment on a wrong application of the separation of variable idea as applied to derive an important equation of the cinematic of particles. We also point out conceptual errors on how the pointed equation should be applied.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Physics education research; mathematics in physics; physics problem solving; quantitative reasoning.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">PACS: 01.40.gb; 01.40.Ha; 01.40.Fk</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmfe/v57n2/v57n2a1.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>  	    <p align="justify"><font face="verdana" size="2">*. Actualmente de a&ntilde;o Sab&aacute;tico en el The Physics Education Research Laboratory of The University of Maine, Orono, Maine, USA.</font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. S. D&iacute;az&#150;Sol&oacute;rzano y L.A. Gonz&aacute;lez&#150;D&iacute;az, "Separaci&oacute;n de variables en la ecuaci&oacute;n cinem&aacute;tica <i>v</i><sup>2</sup> = <i>v</i><sup>2</sup><sub>0</sub> + 2<sup>&#8594;</sup>a &#916;<sup>&#8594;</sup>r y su importancia" <i>Rev. Mex. F&iacute;s.</i> <b>56,</b> 141&#150;143 (2010).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8620063&pid=S1870-3542201100020000100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">2. Alonso, M. y Finn, E. (1970) F&iacute;sica, Vol. 1 Mec&aacute;nica. Fondo Educativo Interamericano.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8620065&pid=S1870-3542201100020000100002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">3. Arfken, G. (1985) Mathematical Methods for Physicist, 3rd. Ed., Academic Press.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8620067&pid=S1870-3542201100020000100003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">4. S. Rojas, " On the teaching and learning of physics problem solving," <i>Rev. Mex. F&iacute;s. E</i> <b>56,</b> 22&#150;28 (2010).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8620069&pid=S1870-3542201100020000100004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">5. S. Rojas, "Repeated Problem Solving Revisited," <i>Am. J. Phys.</i> <b>77,</b> 487&#150;488 (2009).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8620071&pid=S1870-3542201100020000100005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">6. S. Rojas, "On the need to enhance physical insight via mathematical reasoning," <i>Rev. Mex. F&iacute;s. E</i> <b>54,</b> 75&#150;80 (2008).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8620073&pid=S1870-3542201100020000100006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      ]]></body>
<back>
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