The Development for Instructional Media of Physics in Free Fall Experiment

Abstract

The free fall is a movement under acceleration of gravity influence.   The approximate gravitational acceleration on the earth is 9.81 m/s2 which     is used as a reference for the free fall experiment. This purpose of the research is to study and design instructional media of physics in the free fall experiment using AVR Arduino UNO microcontrollers circuit and IR censors for time counting ( t) by the object falling. The free fall experiment has a station for testing object movement of four heights (0.2, 0.4, 0.6 and 0.8 m). The testing spherical objects are 3.56 cm in diameter and two different masses 14.90 g for No.1 (Wood ball) and 30.88 g for No.2 (Billiards ball). It is found that for  the counting time of object falling will be increased by a distance height.  The testing with object No.1 and No.2 have the average gravitational acceleration of 9.76 m/s2 and 9.72 m/s2 with the percentile of error is 0.41 % and 0.81 % respectively in comparison to the approximate gravitational acceleration on the earth