<![CDATA[Harmonic motion is a physics topic that requires a solid conceptual understanding because it involves the abstract relationship among mass, oscillation period, and the spring constant. However, conventional teaching methods often limit students' interactive learning experiences. This study aimed to optimize the use of a student worksheet (LKPD) integrated with the PhET "Masses and Springs" simulation as a learning medium for harmonic motion at SMAN 7 Mataram. The activity involved 11 students of Class XI A2, divided into two groups, and was conducted using a qualitative descriptive approach in a single learning session. Students used the LKPD to formulate hypotheses, conduct virtual experiments, record data, and draw conclusions. The results showed that the integrated LKPD and PhET simulation increased students' engagement and helped them visualize harmonic motion concepts more effectively. However, limited instructional time prevented some students from completing all LKPD activities. Therefore, the LKPD integrated with PhET simulations can be used as an alternative physics learning medium, provided sufficient time is allocated for its implementation.]]>
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