Abstract
The concepts of force and motion are essential material in physics. However, students experience many difficulties in the concept of force in rotational dynamics. This research was conducted to measure students’ concept acquisition of the rotational dynamics through Interactive Demonstration assisted by Free-body diagram. The mixed research method was chosen through the use of test instruments in the forms of 10 multiple-choice with open ended questions. The subjects of the research were 35 students XI IPA Senior High School 2 Sungai Penuh-Indonesia. Students’ concept acquisition was measured before and after the intervention to be analyzed quantitatively. The obtained N-gain score was 0.47, and it showed that there was a moderate improvement in students’ concept acquisition, while the effect size value was 1.82 showing that the intervention strongly affected students’ concept aquisition. The data were also supported by the results of the qualitative analysis of the students’ answers and worksheets given during the intervention process.
Highlights
The most important concept is about force and motion (Carvalho & Sousa, 2005)
There is a small amount of research conducted on Newton’s law in rotational dynamics, even though it is one of the physics content that are difficult to be understand by students (Mashood & Singh, 2012; Kladivova & Mucha 2014)
The verification stage aims to strengthen the concept developed by the students and once again, the students made predictions, free-body diagrams, and provide explanations related to the demonstration that was going to be given
Summary
The most important concept is about force and motion (Carvalho & Sousa, 2005). Such concept is crucial to be studied and mastered by students (Robinson, 2014). The concepts of force and motion always relate to the Newton’s law. Newton’s law in translational motions has frequently been studied in education research. Students face difficulties in determining the effect of force on a rotational motion (Rimoldini & Singh, 2005; Mashood & Singh, 2012; 2015; Close, et al, 2013), and explaining the effect of mass distribution in moment of inertia (Leyvraz 2015)
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