Angel "Java" Lopez en Blog

Publicado el 15 de Julio, 2010, 0:06

PrincipiaEn estos días, me enviaron un enlace excelente, de donde podemos bajar una edición electrónica del clásico de Isaac Newton, The mathematical principles of natural philosophy (c1846):

http://www.archive.org/details/newtonspmathema00newtrich

Es un libro que había ojeado hace unos años, y que no tengo en mi biblioteca. Si bien ya pertenece a la historia, y no tanto al estudio de la física, es interesante leerlo para ir viendo cómo Newton plantea la "nueva física", sus leyes, la inercia, las fuerzas, temas que habían comenzando a aparecer, en parte, en Galileo, Kepler y otros. Me detengo hoy en parte del prefacio del propio autor:

Our design not respecting arts, but philosophy, and our subject not manual but natural powers, we consider chiefly those things which relate to gravity, levity, elastic force, the resistance of fluids, and the like forces, whether attractive or impulsive ; and therefore we offer this work as the mathematical principles :f philosophy ;  for all the difficulty of philosophy seems to consist in this from the phenomena of motions to investigate the forces of nature, and then from these forces to demonstrate the other phenomena ; and to this end the general propositions in the first and second book are directed. In the third book we give an example of this in the explication of the System of the World : for by the propositions mathematically demonstrated in the former books, we in the third derive from the celestial phenomena the forces of gravity with which bodies tend to the sun and the several planets. Then from these forces, by other propositions which are also mathematical, we deduce the motions of the planets, the comets, the moon, and the sea. I wish we could dorive the rest of the phenomena of nature by the same kind of reasoning from mechanical principles; for I am induced by many reasons to suspect that they may all depend upon certain forces by which the particles of bodies. by some causes hitherto unknown, are either mutually impelled towards each other, and cohere in regular figures, or are repelled and recede from each other; which forces being unknown, philosophers have hitherto at tempted the search of nature in vain ; but I hope the principles here laid down will afford some light either to this or some truer method of philosophy.

Hoy, con el Large Hadron Collider y sus experimentos en el CERN, estamos buscando conocer más de esas "certain forces by witch the particles....". Hoy tratamos de otro tipo de "partículas" de las que se refería Newton, pero igual hoy sobreviven las fuerzas, las "atracciones y repulsiones", pero de otra manera, en la fascinante física cuántica.

Pero la gravedad de Newton, luego transformada por Einstein, aún pervive como ejemplo de fuerza. Me gustaría más adelante, reproducir y comentar las tres leyes de Newton. Será en otro post.

Noten cómo no había aparecido todavía la palabra "científico": para Newton, eran filósofos naturales.

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
http://twitter.com/ajlopez

Por ajlopez, en: Ciencia