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All Journal Optika : Jurnal Pendidikan Fisika Jurnal TELUK: Teknik Lingkungan UM Kendari
Destina, Destina
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Education Engineering Environmental Science Physics

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KAJIAN EFISIENSI ENERGI PADA SISTEM REM SEPEDA MOTOR DENGAN KONSEP HUKUM KEKEKALAN ENERGI Nurhamidah, Nurhamidah; Antika, Nur; Destina, Destina; Nuraini, Nuraini
OPTIKA: Jurnal Pendidikan Fisika Vol. 9 No. 2 (2025): OPTIKA: Jurnal Pendidikan Fisika
Publisher : Department of Physics Education, Faculty of Teacher Training and Education, Universitas Flores

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37478/optika.v9i2.7062

Abstract

Penelitian ini bertujuan untuk menyelidiki efisiensi energi pada sistem pengereman sepeda motor berdasarkan Hukum Kekekalan Energi. Fokus penelitian terletak pada perubahan energi kinetik menjadi energi panas selama proses pengereman serta tingkat efisiensi yang dicapai. Metode penelitian yang digunakan adalah eksperimen dengan mengukur peningkatan suhu cakram rem setelah pengereman pada tiga variasi kecepatan, yaitu 20 km/jam, 40 km/jam, dan 60 km/jam. Hasil pengamatan menunjukkan bahwa peningkatan suhu cakram rem berbanding lurus dengan kecepatan awal, masing-masing sebesar 8,2°C, 13,3°C, dan 23,1°C. Berdasarkan analisis, sekitar 80% energi kinetik kendaraan dikonversi menjadi energi panas, dengan nilai energi panas masing-masing sebesar 1.728 J, 6.913 J, dan 15.554 J. Temuan ini menunjukkan bahwa efisiensi pengereman dipengaruhi oleh kecepatan awal kendaraan, tekanan pengereman, dan karakteristik material kampas rem. Penelitian ini menegaskan penerapan prinsip kekekalan energi dalam sistem pengereman serta memberikan wawasan untuk pengembangan desain pengereman yang lebih efektif dan aman. Penelitian ini bertujuan untuk menganalisis penerapan hukum kekekalan energi dalam proses pengereman sepeda motor, menghitung besar konversi energi kinetik menjadi energi panas pada berbagai tingkat kecepatan, serta menilai efisiensi kerja sistem rem.
Analisis Temporal Kualitas Udara dan Variasi Suhu di Kota Palembang Berdasarkan Data IQAir Putri, Jamiatul Khairunnisa; Diansyah, Pras; Destina, Destina; Suriani, Febri; Seftini, Rien
Jurnal TELUK: Teknik Lingkungan UM Kendari Vol. 6 No. 1 (2026): Edisi Juni Tahun 2026 Jurnal TELUK: Teknik Lingkungan UM Kendari
Publisher : Universitas Muhammadiyah Kendari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51454/teluk.v6i1.1732

Abstract

Palembang is one of Indonesia’s major cities, characterized by high levels of transportation, trade, and development activity. The intensity of these activities can affect urban environmental conditions, including air quality and fluctuations in temperature over time. This study aims to analyze the temporal changes in air quality and temperature variations in Palembang City during the period of May 1–14, 2026, and to examine the relationship between the two variables. The data used consist of the Air Quality Index (AQI) obtained from IQAir and air temperature data from BMKG. The research method employed is a descriptive quantitative approach with statistical analysis, including descriptive analysis, time series graphs, Pearson correlation, simple linear regression, and t-test. The results show that the AQI values fall within the moderate category, ranging from 52 to 88, while the air temperature ranges from 26.8°C to 29.2°C and tends to be relatively stable. The correlation analysis indicates a negative relationship between temperature and AQI with a coefficient of -0.401, meaning that an increase in temperature tends to be followed by a decrease in AQI values. However, this relationship is not statistically significant (p > 0.05). The linear regression results also show that temperature does not have a significant effect on air quality. Thus, it can be concluded that changes in air quality in Palembang City are not solely influenced by air temperature, but also by other factors such as transportation activities, vehicle emissions, and other meteorological conditions.
Co-Authors Antika, Nur Diansyah, Pras Nuraini Nuraini Nurhamidah Nurhamidah Putri, Jamiatul Khairunnisa Seftini, Rien Suriani, Febri