The aim of this work is to present a tool developed in a multimedia environment of a cilitate the understanding of the state of plane stress at an infinite simal element, which is directed to lectures in Mechanics of Materials courses. This multimedia resource was developed in Java 3D API, liked an applet, as it is a simple language whose programs can run on all operating system platforms, using the virtual machineconcept. The multimedia resource determines the strains caused by forces acting in a solid body. Usingthis tool the learning process can be more efficiently, and the view of results at an differential element in the state of plane stress can be easier too. © (2014) Trans Tech Publications, Switzerland.467 590593Assis, W.S., Bittencourt, T.N., Moronha, M., (2002) Development of Multimedia Resources For Teaching Concrete Structures, , IBRACON, São Paulo, BrazilSelman, D., (2002) Java 3D Programming, , Manning Publications, 1a ediçãoBeer, F.P., Johnston, R.E., (1995) Mechanics of Materials, , 3rd ed. - São Paulo, Brazil, MAKRON Books