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All Journal Jurnal Sains dan Teknologi Jurnal Pendidikan MIPA
Watuna, Monica Ananda
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Computer Science & IT Education

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Enhancing Students’ Mathematical Representation and Learning Motivation through Problem-Based Learning Worksheets in the Sound Wave Topic Watuna, Monica Ananda; Dwandaru, Wipsar Sunu Brams; Nasir, Muhammad Hilmi; Wiyatmo, Yusman
Jurnal Pendidikan MIPA Vol 26, No 3 (2025): Jurnal Pendidikan MIPA
Publisher : FKIP Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jpmipa.v26i3.pp1610-1623

Abstract

This study aims to examine the implementation of student worksheets based on the problem-based learning model to enhance students’ mathematical representation skills and learning motivation in the topic of sound waves. Problem-based learning (PBL) makes the study of sound waves more engaging for students by emphasizing the comprehension of ideas and their application in the real world, rather than memorizing formulas. The research was conducted in Class XI of SMA Negeri 1 Godean, Yogyakarta, involving 33 students, using a quantitative approach and a pre-experimental design in the form of a one-group pretest-posttest design. The instruments used were a mathematical representation ability test and a learning motivation questionnaire. The data analysis results showed an increase in the average post-test scores compared to the pre-test. Based on the paired sample t-test, students' mathematical representation skills showed a statistically significant improvement (p < 0.001) with an N-gain score of 0.68, resulting in an increase in scores from 51 to 85. This result is supported by the effectiveness test using Cohen's d, which indicated a very large effect size (d = 2.35). Meanwhile, students' learning motivation showed a statistically non-significant increase (sig. = 0.055 > 0.05), with an N-gain score of 0.038 and a slight increase in scores from 48 to 50. Cohen's d effect size test for learning motivation fell into the small effect category (d = 0.32). Although not statistically significant, there was an indication of improved student learning outcomes after the intervention, as reflected in the mean score differences. These results show that problem-based learning models integrated into student worksheets are highly effective in enhancing students' mathematical representation abilities and raising their motivation to learn. Therefore, the implementation of problem-based learning student worksheets can serve as an effective alternative instructional strategy in physics education, particularly in improving students' cognitive aspects. Further research with a more extended implementation period and a more comprehensive approach is recommended to optimize the impact on affective aspects.   Keywords: problem-based learning, student worksheet, mathematical representation, learning motivation, sound waves.
A Green Synthesis of Fe3O4 Nanoparticles with Moringa Oleifera Leaf Extract as Methylene Blue Absorbent Watuna, Monica Ananda; Dwandaru, Wipsar Sunu Brams; Suparno
JST (Jurnal Sains dan Teknologi) Vol. 14 No. 2 (2025): July
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jst-undiksha.v14i2.92270

Abstract

This research is motivated by the high content of methylene blue dye waste in waters, which is difficult to overcome with conventional methods. In addition, not many studies develop environmentally friendly methods based on natural materials such as Moringa oleifera leaf extract to synthesize effective absorbent nanoparticles. This study aims to conduct green synthesis of Fe₃O₄ nanoparticles (NPs) using Moringa oleifera leaf extract. In addition, another objective is to test the absorption ability of Fe₃O₄ NPs towards methylene blue dye. The method used in this study is experimental. The experiment began with synthesizing Fe3O4 NPs through green synthesis and their characterization using XRD, FTIR, UV-Vis, and PSA. Next, an absorption test of Fe₃O₄ NPs was carried out against methylene blue solutions with variations in mass of 1 g, 2 g, and 3 g. The results showed the formation of Fe3O4 NPs based on the characterization results of Fe3O4 NP samples. XRD showed no sharp peak at 2 angle indicating that the material structure is amorphous. PSA analysis confirmed the presence of nano-sized material of 196 nm, as much as 34.7%. The FTIR spectrum showed the presence of C–H, C–O, C–C, and C–N functional groups, indicating the success of green synthesis. In addition, the presence of Fe–O functional groups in the range of 570–580 cm¹ also supports the formation of NPs. The results of the UV-Vis test of methylene blue solution that had undergone absorption by NPs showed a significant decrease in sample absorption along with the increase in NP mass, which was reinforced by a visual change in the color of the solution, which became clearer. In conclusion, the synthesis of Fe₃O₄ NPs through green synthesis can be an effective and environmentally friendly method for dye waste treatment. This research has important implications in developing environmentally friendly technologies for handling dye waste in waters, because it shows the potential for utilizing abundant and inexpensive natural materials as reducing agents and stabilizers for pollutant-absorbing nanoparticles.
Co-Authors Nasir, Muhammad Hilmi Suparno Wipsar Sunu Brams Dwandaru Yusman Wiyatmo