The results of previous researches indicated that there were problems with the mental model and students’ conceptual understanding of the action-reaction law (Newton’s third law, NTL). This research aimed to reveal the effect of a simple approach in teaching NTL. The research was conducted in the first-year of pre-service physics teachers at the Physics Education Department of Tadulako University. Research designs for three consecutive years were (1) one-group, pre-test, and post-test design, (2) a static group comparison (pre-test for the experimental group), and (3) a quasi-experimental. The approach used was an interactive demonstration that consisted of five phases, i.e: eliciting an intuitive argument, demonstrating a continuous force: pulling, demonstrating a continuous force: pushing, demonstrating impulsive force: collisions, and refining the concept with Elby’s pair. Data were collected using a multiple-choice test developed in previous research. The results of the data analyses showed that the approach could improve students’ understanding of the action-reaction law, supporting conceptual change by exhibiting N-gain in the moderate and high categories. The instructional design can be considered for implementation in learning in high schools, lecture on pre-service physics teachers and basic physics lecture, in general..
<p style="text-align: justify;">This study aims to explore the pattern of external representation of suspending objects in a static fluid. The study used a qualitative descriptive method involving 57 elementary, junior, senior school, and university students. Data collection implemented a 30-item test covering the dominant context of suspending and partially floating and sinking. Some of phenomenographic steps were adapted in data analysis. Based on the data analysis, it can be concluded that there is a dominant external representation pattern, where there is a simplification of the depiction of suspending objects. Suspending position tends to be locked in a limited area, namely in the middle of the depth of the liquid. In the context of suspending objects' cuts, the cuts were generally represented by an upward shifting pattern. Factors that influence the pattern of representation are the involvement of intuition in conceptualizing the phenomena presented, and the conceptual aspect of density has not been integrated into the reasoning process for compiling external representations, both diagrams, and texts. Research limitation is presented in this article.</p>
This research was aimed to describe the causal reasoning of students in physics problem-solving. The research subjects were students of Physics Education Study Program of Universitas Tadulako. The research respondents consisted of two students obtained through a selection test of respondents representing the categories of high ability. Data collection through thinking-aloud activity and it was followed by an interview. The thinking-aloud data were analyzed according to Pearl which illustrates how students use students’ causal reasoning in solving the problem. Based on data analysis it can be concluded that causal reasoning has an important role for students when solving the problem. The causal reasoning process conducted by the respondents through the collection of information from the problem; structural equalization of the problem elements with elements of events known by the respondents; reviewed information for the provision of intervention or manipulation in the appropriate decision-making; and made a conclusion by considering a paradox and conflicting of the data on the problem.
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