Unlabelled: The study investigated the impact of PhET simulation-based learning on students' motivation and academic achievement in learning oscillations and waves among Malawian secondary students. The following research questions guided the study: (i) What were students' motivation and academic achievement levels at the beginning of the study in oscillation and waves? (ii) To what levels do PhET interactive simulation-based learning impact students' motivation and achievement in oscillations and waves? (iii) Is the change in post-test scores due to the students' characteristics in non-randomized settings or the PhET interactive simulation-based learning? A sample of 280 (44.6% females) form three secondary school students with a mean age of 17.
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