Students' Physics Competencies aren’t still optimal. One of the causes is using the teaching materials in forming of student’s worksheets that has not yet suitable with the structure of a good student worksheets, not yet containing the use of the inquiry based learning model and scientific approach. The purpose of this study was to describe the characteristics and produces student worksheets using the inquiry based learning model with a scientific approach to improve physics  in class 10th competencies with valid, practical, and effective criterias. This type of research is design research using the Plomp model which consists of the preliminary research stage, development or prototyping phase, and assessment phase. The data analysis technique uses descriptive percentages. Research on the stage of preliminary research obtained that needs analysis, the analysis of learners, and analysis of the material is required to be a reference to development of student worksheets uses the inquiry based learning model with scientific approach.  The results of the study at the design stage were obtained by student worksheets designed using an inquiry based learning model with a scientific approach. The results of the development phase of the student’s worksheets meet the valid criteria of 0.94. The results of the implementation phase of the student worksheets meeting the very practical criteria of the teacher’s responses in the questionnaire were 91.05% and students 78.39% with practical criteria. The evaluation phase of the student worksheets was found the effective criteria with an 85.81% attitude value, 85.46% knowledge, and 85.69% skills. Based on the results of the study, it can be concluded that the student  worksheets uses the inquiry based learning model with an effective scientific approach to improve high school physics class X competencies in the form of attitudes, knowledge, and skills.