Application of Internet of Things-Applied Ultrasonic Sensor for Physics Experiment in the Coefficient of Kinetic Friction
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This research studied characteristics and sensing abilities of HC-SR04 ultrasonic sensor and applied internet of things to HC-SR04 ultrasonic sensor for physics experiment in coefficient of kinetic friction using knowledge of motion along a straight line with constant speeds and Stoke’s law to find the coefficients of kinetic friction between uPVC and borosilicate glass. The correlation between angular position of the obstacle object and displacement reading from HC-SR04 ultrasonic sensor was found in this research. Moreover, detections in percentages of HC-SR04 ultrasonic sensor were different in the displacement detections between the obstacle objects having their diameters larger/smaller than those of transmitter and receiver of HC-SR04 ultrasonic sensor. The coefficients of kinetic friction between uPVC and borosilicate glass were found in the range of 0.30-0.53. Furthermore, the correlation between speed of the obstacle object and kinetic friction force, and the correlation between normal force and coefficient of kinetic friction were found in this research. The displacement reading between the obstacle object and HC-SR04 ultrasonic sensor using HC-SR04 ultrasonic sensor-applied internet of things has more precision than that using manual devices consisting of a measuring tape and a stopwatch. The results provide similar accuracy between internet of things-applied HC-SR04 ultrasonic sensor and the manual devices in the case of applying the normal force of ³1.58 N.
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