Resumen

MANZUR, A. Colisión en dirección vertical. Rev. mex. fís. E [online]. 2008, vol.54, n.1, pp.55-58. ISSN 1870-3542.

The demonstration experiment here presented illustrates a situation where the conservation laws of linear momentum and mechanical energy are not satisfied; however, their use allows a good qualitative description of the result observed. The objective is satisfactorily gotten by the analysis of the vertical collision between two balls. The balls with the appropriate masses are dropped, the small mass resting on top of the larger mass; after the collision between the bottom ball and the floor this ball does not have vertical motion, whereas the top ball rebounds up to a height higher than its original height

Palabras llave : Demonstration experiments; teaching methods; vertical collisions.

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