As for the first goal of the research, it did not reveal any significant difference in
understanding the concept of the mass between the students in the two groups. Both, real
experiments and computer simulations were very similar, which enabled the students to
perform very similar activities. The biggest difference was that the students in the RE group
had more technical and hands-on activities, while the students in the ICT group had just to
click the mouse button and to drag-and-drop the virtual objects, which obviously, did not
produce almost any difference in understanding the concept of mass. Therefore, when it
comes to understanding of concept of mass, students from both groups will be considered as
one group. Presented results are inferred from students’ answers to questions posted on both
pretest and posttest, and represent quantitative reflection on students understanding of concept
of mass