The use of computers and web pages has become an inseparable part of everyday life and also increasingly popular in teaching at all levels. Developed e-learning materials may be an interesting addition to the learning process, in particular for natural sciences. In the frame of our national project we have prepared some primary school physics topics in the e-learning materials. They are helpful in explaining the real world by encouraging pupils to conduct the described experiments or their own variants of them, either at school or at home. Teachers who have tried our e-learning materials in their school practice were very satisfied and they expressed the wish for other physics topics prepared in this way. In addition, they suggested some minor changes in the representation of these materials. We have come to conclusion that in the future preparation of e-learning materials, we should closely cooperate with teachers, programmers, as well as didactics of natural and computer sciences.