Aplikasi Sensor Accelerometer pada Smartphones untuk Inovasi Pembelajaran Hukum Kedua Newton dan Gesekan Kinetik

Abstract

Decades of improvements in microelectromechanical systems have enabled high-performance sensors to be integrated into smartphones. The combination of sensors with touchscreens, high-performance microprocessors for data analysis, and high-speed data transfer via Wi-Fi or Bluetooth on smartphones provides the ability to conduct scientific research. The capabilities of smartphones, combined with the learning process of high school students, have the potential to revolutionize inquiry-based learning in physics education. Researchers have widely reviewed physics experiments using sensors embedded in smartphones. Therefore, this community service program, through the "Dosen Pulang Kampung" program, aims to utilize microelectromechanical system sensors to determine the coefficient of kinetic friction. This also provides students with the opportunity to explore many fundamental physics concepts, particularly mechanics, using smartphones. The experimental design was conducted on uniform horizontal surfaces, for example, a rough floor (covered with a rough sandpaper surface) and a smooth floor (covered with aluminum foil). The smartphone's acceleration was measured for short durations of motion while subjected to varying forces. The smartphone should be placed in a container and/or attached to the container, which slides to create a smooth, uniform surface, allowing it to slide along a horizontal surface. Different combinations of surfaces will result in different values for the coefficient of friction. The smartphone or the sliding container should be connected to a spring or a rubber band, which is used to provide an initial force to accelerate the smartphone. Students can explore various potential ways to attach the spring or rubber band to the smartphone. Initially, the smartphone is held in place while stretching the spring or rubber band until it is taut, and the desired initial elastic potential energy is achieved. The desired initial elastic energy will vary depending on the mass of the phone and the coefficient of friction. The ratio of the friction force to the mass of the container plus the smartphone will provide the coefficient of friction.