This paper presents the design and implementation of teaching the topic “Projectile Motion” in the high school Physics curriculum using the flipped classroom model combined with active learning methods to enhance students’ self-learning competence. The study focuses on developing a systematic teaching process, including pre-class learning materials (lecture videos, instructional documents, and guiding questions) and in-class learning activities (group discussions, problem-solving, and applied practice) oriented toward competency development. A pedagogical experiment was conducted at Nguyen Du High School and Tuong Duong 1 High School using various assessment tools such as questionnaires, tests, and classroom observations. The collected data were processed and analyzed using appropriate statistical methods to evaluate the effectiveness of the proposed teaching model. The results indicate that the integration of the flipped classroom with active learning methods not only improves students’ activeness and learning motivation but also significantly enhances their self-learning competence and knowledge acquisition in studying the topic of “Projectile Motion.” The study thereby confirms the feasibility and effectiveness of this model in innovating Physics teaching methods in high schools today.