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Lontar Physics Today
Published by Universitas PGRI Semarang
ISSN : -     EISSN : 28280970     DOI : https://doi.org/10.26877/lpt
Core Subject : Science, Education,
Education Physics
LONTAR PHYSICS TODAY is a scientific journal published by the Physics Education Study Program, Universitas PGRI Semarang with the scope of all areas in the fields of physics and physics education. Lontar Physics Today papers will be published three times a year on February, June, and Nopember by Physics Education study program, Universitas PGRI Semarang, Semarang, Central Java, Indonesia. Please read this guide carefully. Authors who wish to submit their manuscripts to the editors of the Lontar Physics Today must comply with the writing guidelines. If the submitted manuscript does not comply with the guidelines or is written in a different format, it will be rejected by the editor before further review. The editor will only accept manuscripts that meet the specified format.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol 4, No 1 (2025): February 2025" : 5 Documents clear
Analisis Kemampuan Pemahaman Konsep Siswa Kelas VII SMP Swasta Al Manar Materi Gerak Dan Gaya Parinduri, Siti Nurhidayati; Hati, Suci; Zakiah, Putri; Sari, Dwi Novita
Lontar Physics Today Vol 4, No 1 (2025): February 2025
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/lpt.v4i1.21586

Abstract

Penelitian ini bertujuan untuk menganalisis kemampuan pemahaman konsep siswa kelas VIII SMP Swasta Al-Manar pada materi gerak dan gaya. Subjek penelitian terdiri dari 23 siswa. Metode yang digunakan adalah deskriptif kuantitatif dengan instrumen tes yang mencakup soal essay, yang dirancang untuk mengukur indikator pemahaman seperti menyatakan ulang konsep, mengklasifikasikan objek, menerapkan konsep dalam pemecahan masalah. Hasil analisis menunjukkan bahwa rata-rata kemampuan pemahaman konsep siswa berada pada kategori cukup dengan nilai rata-rata 80. Indikator dengan penguasaan tertinggi adalah mengklasifikasikan objek dan menerapkan konsep dalam pemecahan masalah, sedangkan menyatakan ulang konsep memiliki persentase terendah. Temuan ini menunjukkan perlunya pengembangan strategi pembelajaran yang lebih efektif untuk meningkatkan pemahaman siswa terhadap konsep gerak dan gaya.
Analysis of Atmospheric Conditions During Heavy Rain Using Adiabatic Lapse Rate in Tangerang City Amalia, Rizkika; Ruhiat, Yayat; Septiyanto, Rahmat Firman
Lontar Physics Today Vol 4, No 1 (2025): February 2025
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/lpt.v4i1.22647

Abstract

This study aims to understand the rate of temperature decrease in atmospheric conditions and determine the comparison between atmospheric stability and rainfall in Tangerang City using daily rainfall data and upper air data for the period 2019 to 2023. The data was obtained from Soekarno-Hatta Meteorological Station. The results of the analysis showed that the highest rainfall occurred in February 2020, with a total of 23 rainy days. In addition, lapse rate analysis indicates that atmospheric conditions are in a conditionally unstable state for 25 days. However, there is a difference between the number of rainy days and the number of days with unstable conditions, indicating that atmospheric instability does not always lead to precipitation. This study explains that although rain occurs under unstable atmospheric conditions, not all unstable conditions produce rain. Therefore, this study recommends the need for further studies to understand the complex interactions between meteorological factors that influence heavy rainfall phenomena in the region.Keywords: atmosphere, lapse rate, precipitation
Perancangan Alat Ukur Kuat Medan Magnet Berbasis Arduino Uno Menggunakan Sensor UGN-3503 Lumempow, Greity Syaloom; Derek, Glladyvio; Marianus, Marianus; Tumangkeng, Jeane Verra; Pawarangan, Ishak
Lontar Physics Today Vol 4, No 1 (2025): February 2025
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/lpt.v4i1.22916

Abstract

Pemahaman konsep medan magnet dalam pembelajaran fisika sering mengalami hambatan akibat keterbatasan alat peraga di sekolah. Untuk mengatasi permasalahan tersebut, penelitian ini bertujuan merancang dan mengembangkan alat ukur kuat medan magnet berbasis sensor UGN-3503 menggunakan mikrokontroler Arduino Uno. Metode penelitian yang digunakan adalah Research and Development (RD) dengan tahapan perancangan/perencanaan, pembuatan, dan pengujian alat. Hasil penelitian menunjukkan bahwa alat ukur medan magnet yang telah dirancang mampu beroperasi secara optimal pada jarak pengukuran 2-10 cm dengan tingkat akurasi secara rata-rata sebesar 97%. Hasil pengujian juga menunjukkan hubungan linier antara nilai pengukuran alat dan nilai perhitungan teoritis dengan koefisien determinasi  sebesar 0,9619 hasil alat dan 0,9636 hasil teoritis. Meskipun terjadi penurunan akurasi pada jarak di atas 10 cm, secara keseluruhan alat ini dapat digunakan sebagai media praktikum fisika di sekolah. Penelitian ini memberikan kontribusi terhadap pengembangan alat praktikum dalam memperkuat pemahaman konsep medan magnet pada peserta didik melalui pengukuran langsung secara digital.Kata kunci: alat ukur digital, medan magnet, sensor UGN-3503 Abstract. Understanding the concept of magnetic fields in physics is often hindered by the limited availability of instructional materials in schools. To address this issue, this study aims to design and develop a magnetic field strength measurement device utilizing a UGN-3503 sensor interfaced with an Arduino Uno microcontroller. The study employed a Research and Development (RD) methodology comprising the design, fabrication, and testing of the device. The results indicate that the designed magnetic field measurement device can operate optimally at measurement distances ranging from 2 to 10 cm, achieving an average accuracy of 97%. Furthermore, testing revealed a linear relationship between the device’s measured values and teorits calculations, with coefficients of determination (R²) of 0.9619 and 0.9636 for the device’s measurements and teoritis calculations, respectively. Although accuracy decreases beyond 10 cm, the device remains a viable tool for use in school physics labs. This study contributes to the development of educational laboratory equipment by strengthening students’ understanding of magnetic field concepts through direct digital measurement.Keywords: digital measuring device, magnetic field, UGN-3503 sensor
Rancang Bangun Alat Ukur Massa Jenis Zat Cair Digital Berbasis Arduino Uno Menggunakan Sensor Load Cell Mottoh, Ferlitha Frisilia; Makarawung, Putri S; Marianus, Marianus; Tumangkeng, Jeane Verra; Pawarangan, Ishak
Lontar Physics Today Vol 4, No 1 (2025): February 2025
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/lpt.v4i1.23084

Abstract

Minimnya ketersediaan alat ukur massa jenis digital yang memadai dan akurat di sekolah menjadi salah satu kendala dalam pembelajaran konsep fluida, khususnya massa jenis zat cair. Penelitian ini bertujuan merancang dan mengembangkan alat ukur massa jenis zat cair digital berbasis mikrokontroler Arduino Uno dengan menggunakan sensor load cell dan modul HX711. Metode yang digunakan adalah Research and Development (RD), yang mencakup tiga tahap utama, yaitu perencanaan, perakitan, dan pengujian alat. Perangkat yang dikembangkan dirancang agar mampu mengukur massa cairan secara langsung melalui tekanan dari sensor load Cell, kemudian menghitung massa jenis berdasarkan volume tetap dan menampilkan hasilnya secara digital pada layar LCD 16×2. Hasil pengujian menunjukkan bahwa alat dapat mengukur massa jenis air dan minyak goreng dengan tingkat akurasi yang cukup baik. Rata-rata galat pengukuran untuk air sebesar ±3,50%, sedangkan untuk minyak sebesar ±5,94%. Nilai koefisien determinasi (R²) sebesar 0,9532 untuk air dan 0,9531 untuk minyak menunjukkan bahwa alat bekerja secara stabil dan konsisten pada setiap pengukuran berulang. Berdasarkan hasil tersebut, alat ini dinilai layak digunakan sebagai media pembelajaran eksperimen fluida di tingkat pendidikan menengah, serta dapat menjadi alternatif alat praktikum digital yang efektif dan memadai.Kata kunci: massa jenis, arduino uno, sensor load cell Abstract. The lack of availability of adequate and accurate digital density measuring instruments in schools is one of the obstacles in learning fluid concepts, especially the density of liquids. This research aims to design and develop a digital liquid density measuring instrument based on Arduino Uno microcontroller using load cell sensor and HX711 module. The method used is Research and Development (RD), which includes three main stages, namely planning, assembly, and tool testing. The developed device is designed to be able to measure the mass of the liquid directly through the pressure of the load cell sensor, then calculate the density based on a fixed volume and display the results digitally on a 16×2 LCD screen. The test results show that the device can measure the density of water and cooking oil with a fairly good level of accuracy. The average measurement error for water is ±3.50%, while for oil is ±5.94%. The coefficient of determination (R²) value of 0.9532 for water and 0.9531 for oil shows that the device works stably and consistently in each repeated measurement. Based on these results, this tool is considered feasible to use as a medium for learning fluid experiments at the secondary education level, and can be an effective and adequate alternative to digital practicum tools.Keywords: density, arduino uno, load cell sensor
Rancang Bangun Alat Peraga Efek Doppler Menggunakan Sensor GY-MAX4466 Berbasis Arduino Uno Kumendong, Igreya Mitchell; Marianus, Marianus; Tumangkeng, Jeane Verra; Pawarangan, Ishak
Lontar Physics Today Vol 4, No 1 (2025): February 2025
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/lpt.v4i1.22863

Abstract

Keterbatasan alat praktikum fisika di banyak sekolah di Indonesia, khususnya untuk materi efek Doppler, menyebabkan rendahnya tingkat pemahaman peserta didik terhadap konsep ini. Penelitian ini bertujuan merancang dan mengembangkan alat praktikum efek Doppler menggunakan Arduino Uno dengan sensor GY-MAX4466 dan sensor FC-51. Metode penelitian yang digunakan adalah Research and Development (RD) dengan tahapan perencanaan/perancangan, pembuatan, dan pengujian alat. Hasil pengujian menunjukkan bahwa alat mampu membaca frekuensi suara pada rentang 250–3500 Hz dengan akurasi mencapai 100% dengan koefisien determinasi sebesar 0,99, sedangkan pengukuran kecepatan benda menunjukkan akurasi antara 94,80% hingga 99,75% terhadap nilai teoritis. Penelitian ini memberikan kontribusi terhadap perancangan dan pengembangan alat praktikum digital dalam meningkatkan pemahaman konsep efek Doppler pada peserta didik.Kata kunci: Efek Doppler, Alat Peraga, Arduino UnoAbstract. The limitations of physics lab props in many schools in Indonesia, especially for the Doppler effect material, cause a low level of understanding of this concept among students. This research aims to design and develop a Doppler effect props using Arduino Uno with GY-MAX4466 sensor and FC-51 sensor. The research method used is Research and Development (RD) with the stages of planning/designing, making, and testing tools. The test results show that the device is able to read the sound frequency in the range of 250-3500 Hz with an accuracy of 100% with a coefficient of determination of 0.99, while the measurement of object speed shows an accuracy between 94.80% to 99.75% of the theoretical value. This research contributes to the design and development of digital practicum tools in improving the understanding of the concept of the Doppler effect in students.Keywords: Doppler Effect, Props, Arduino Uno

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