AU - راضي، مرتضى رعد. AU - عبد الحمزة، غادة شريف AU - مراد، آمنة كاظم AB - The research aims to identify the effectiveness of John Zahorek's model in: 1) Achieving of the second grade students of the middle school in physics. 2) Science operations of the second grade students of the middle school. The researcher prepared two tools; the first tool is (the achievement test) which in its final form will consists of (40) thematic paragraphs of the type (multiple choice) with four alternatives. The second tool is the (Scale of Science Operations)) which in its final form will consists of 32 paragraphs that distributed evenly over the basic science processes which they are (observation, classification, inference, prediction, measurement, communication, numbers use, temporal and spatial relations) In the context of the research results the researcher came out with a set of conclusions and recommendations and suggestions. (Published Abstract) http://search.shamaa.org/abstract_en.gif ID - 127487 OP - ص ص. 765-779 T1 - فاعلية أنموذج جون زاهوريك في تحصيل طلاب الصف الثاني المتوسط في مادة الفيزياء وعمليات العلم لديهم [مقال] UL - 1 http://search.shamaa.org/fulltext.gif https://www.iasj.net/iasj/article/140470 النص الكامل (PDF)