The purpose of this study was to develop the relationship model between understanding the nature of physics (NOP), and students' preference of physics (SPP) in the Sultanate of Oman. The study also aimed to determine if Achievement motivation (Am) mediates the relationship between Independent Variables (understanding of the nature of physics (NOP), and students' preference of physics (SPP). A total of 523 teachers from both genders have been selected as a sample for this study using a random stratified technique from all governorates of the Sultanate of Oman. The study instrument was adapted from literature reviews related to this study. A single questionnaire was used to collect data consisting of the study variables (NOP, SPP, and Am). The gathered data was analyzed by using Structural Equation Modeling (SEM). The findings revealed that significant relationships existed between the NOP, and SPP. Meanwhile, the gender and specialization of respondents were found to have a significant moderating effect on the relationship between NOP and SPP. In contrast, the teaching experience was found not to have a significant moderating effect on the relationship between NOP and SPP. The relationship between NOP and SPP was successfully modeled and represented as The Relationship Model of Nature of Physics, and Students' Preference of Physics in Physics Education. The Model provides significant and valuable contributions to theoretical, methodological, educational practice, and knowledge in the field of physics education research in the Sultanate of Oman. The implications of this study suggest that the model can be used to determine the quality of understanding the nature of physics based on the teachers' achievement motivation in the students' preference of physics.
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