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At IPN a simulation program, named xyZET, was developed to support teaching of physics as well as the preparation of interesting and demanding exercise material. xyZET offers a rich and complex user interface, which allows to reconstruct in 3d-space numerous experiments in basic mechanics and electricity. It is also possible to visualize effects in relation to relativistic changes of mass. Finally, the radiation of accelerated charge carriers can be demonstrated in accordance with the Linard Wiechert theory.
A special learner mode was implemented as an alternative to the normal working environment where all the control elements are at hand. In this learner mode, the program xyZET can be controlled by Java applets embedded in WEB-pages. By clicking on the prepared active buttons, a control is sent to the simulation program, using the TCP/IP protocol. This allows the learner to concentrate fully on the topic, and it frees him or her from any control activity which might divert attention from the contents.
Using xyZET and this external control feature a complete mechanics course was developed, which contains most of the traditional topics taught in 11th grade at German high schools (Gymnasium).
The learning material has been tested under classroom conditions and proven to be stable, feasible and effective. Further improvements can be expected if students have better access to adequate computers and if in general more support and time is provided to practice exploratory and self-supported learning.
The program xyZET was developed under UNIX and X-windows and is running on PC platforms under the free operating system LINUX as well as under Windows95/98.
Key words: simulations, 3d-representation, mechanics, conceptual understanding