This research is within the thematic area education, especially within Didactics of physics, which is based on the existing problems in the teaching and learning of physics both at the level of secondary education and higher education. This research is based on meaningful learning theory raised by Ausubel, which provides valuable elements for the teaching of physics, with higher levels of understanding of the information and resistant to oblivion. The objective was to determine the incidence of the theorem of Lamy in the learning of the equilibrium of three forces, applied to the students of exact sciences of the Universidad National de Chimborazo. It is considered a quantitative correlational research with a quasi-experimental design. The method used was the hypothetical deductive because it allowed to observe the phenomenon, consider a hypothesis for the explanation of the same. By the test of normality of the data is used evidence not parametric and, considering the statistical test of Wilcoxon resulted in a significant difference, between the application of the theorem of Lamy and the analytical method of decomposition of forces in problem solving on equilibrium of three forces.