Development of a Flipped Classroom-Based E-LKPD to Enhance Problem-Solving Skills in Particle Motion Dynamics. JIPFRI [Internet]. 2026 Jun. 4 [cited 2026 Jun. 4];10(1):12-20. Available from: https://journal.unuha.ac.id/index.php/JIPFRI/article/view/5229