In this work we show some results obtained through the application of a test among engineering freshmen. It was intended to reveal the main conceptual difficulties in classical mechanics shown by the students. The test is a version of the "Mechanics Baseline Test", which has been used in some American universities to evaluate the student background in this area. We were able to observe that although the students have a previous knowledge regarding the physics concepts explored in the test, their level of maturity in the subject is still unsatisfactory, prevailing ideas based on an imprecise common sense.
