This study investigated the effects of using a mastery learning approach (MLA) to teach physics to secondary school students compared to a regular teaching method (RTM). The study found that MLA improved student motivation to learn physics more than RTM and that motivation levels were equal between boys and girls when using MLA. MLA involves dividing content into units, formatively assessing students on each unit, and providing additional instruction or enrichment for students who have or have not yet mastered the content. The study was conducted over 3 weeks with 161 students in experimental and control groups and found that MLA enhanced student motivation to learn physics more than RTM.