Description:
In the classroom when you are going to expose a subject of classical mechanics, it is often desirable in addition to present the theory in the blackboard with differential equations to illustrate the phenomenon with a simulation. In this paper I discuss the way in which we can build a simulation of a system of springs and masses using the bundled Easy Java Simulations (EJS) of Francisco Esquembre from the University of Murcia in Spain. This package allows managing the parameters of the simulation, in addition to the advantage of illustrating the physical phenomenon by converting the class in a more interactive experience.