Abstract
The problem that is the focus of this research is the lack of practical tools that can explicitly demonstrate the concept of Straight Motion Regularly Changing (GLBB) on an inclined plane. Therefore, this research aims to create a simple practicum tool named "Lumitime" to study GLBB, with the aim of evaluating the effectiveness and suitability of the tool as a means of learning physics. The research method applied is the research and development (R&D) approach, which is integrated with the ADDIE model (Analysis, Design, Development, Implementation, and Evaluation). Data analysis was conducted using Aiken's V method with the acquisition of assessment scores by material and media experts of 0.75 and 0.69, respectively. The results of user assessment through questionnaires also indicate that this tool is considered "Very Valid" with a value of 0.78. Thus, Lumitime is declared feasible as a practicum tool for illustrating simple GLBB material, with the results showing a high level of validity in various aspects, especially in terms of educational value, relevance to teaching materials, tool durability, and aesthetic aspects. This validity is supported by validation results from material experts and media experts.
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