Validation of PBL-based Physics Virtual Laboratory on Heat and Temperature to Improve Critical Thinking and Mathematical Representation Skills of High School Students

This study aims to analyze the feasibility of PBL-based virtual laboratory for use in learning physics on heat and temperature to improve students' critical thinking and mathematical representation. This research is a R&D study using the ADDIE (Analysis, Design, Developed, Implementation and Evaluation) development research, which consists of five stages: (1) Analysis stage consists of needs analysis, students analysis, curriculum analysis, concept analysis, and analysis of learning objectives; (2) Design, related to designing initial products of PBL-based virtual laboratory learning media and critical thinking and mathematical representation test instruments; (3) Developed stage related to the stage of product preparation, editing, validation, revision, and fields trial; (4) Implement is the stage of implementing products with pretest-posttest control group design and using the quasi experiment method (5) Evaluate is the evaluation process starts from the analysis stage to the implementation stage. The subjects in this study were 108 students of SMA N 1 Kalasan as a field trial. The products developed include PBL-based virtual laboratory learning media, validation assessment sheets, student response questionnaires and test instruments. These products are reviewed by expert validators and practitioners using a 4-point rating scale before being used in trials. The data analysis techniques carried out are descriptive and inferential analysis. The analysis also uses the ideal standard deviation (SBi) to assess the feasibility of learning media and a questionnaire on the practicality of students. While the analysis using V Aiken is to assess the results of the analysis of critical thinking test instruments and mathematical representation. The result of this study showed that the PBL-based virtual laboratory is highly suitable for use in physics learning on heat and temperature to improve critical thinking and mathematical representation, as indicate by evaluations from expert validators, practitioners, and students’ response.