In this works is presented an online Physics course that contributs to the learning process of students that, at the same time, pursue a traditional learning program, so it is a case of blended learning. Though the course contained severallearning resources, were the activities, mainly the discussion forums, the components of the course with more important effects on the learning process. The discussion forums allow the teacher to explore the initial students’conceptions and ideas about the concepts under learning, and the students to express, in a less formal context than the classroom, their concrete experiences. All of that, it is supposed, helps to increase the level of autonomy of students in the learning process.