In the present study, a web site including instructional materials such as Whiteboard Movies (WBM), simulations and animations and testing materials such as true-false, fill-in-the-blanks, puzzles, open-ended questions and multiple-choice questions was designed. The study was carried out with 76 students attending Dicle College (DC), Diyarbakir Anatolian High School (DAHS) and Cumhuriyet Science High School (CSHS) located in the central town of the city Diyarbakir in southeast of Turkey and equipped with computer laboratories and Internet connection in the academic year of 2008 to 2009. Before the application, the data base records were taken regarding the participation of the students in the web activities. At the end of the application, 10 open-ended questions were directed to 19 volunteering students to evaluate the participating students' views about the learning approach used and about the web site designed. The analyses of the responses given to the open-ended questions revealed that the students were generally satisfied with the testing and instructional materials found on the web site developed and that the students still experienced such problems as slowly-opening WBMs, an inadequate number of test forms including multiple-choice questions and insufficient duration of application. Considering the findings as a whole obtained in the study, it was thought that it would be beneficial to use web-based educational applications in teaching physics in schools with better Internet infrastructure and opportunities.