RANCANG BANGUN RANGKAIAN TIMER OTOMATIS PESAWAT ATWOOD

Abstract

A research has been conducted on designing of an automatic  atwood  experiment using an  automatic  timer.  The  automatic timer  consisted  of  3  important components, four relays,  a  stopwatch, and  an  accelerometer.  This automatic  timer  was used to  determine the duration time of the weight falling  from a certain height.  Testing  of the timer was performed on the atwood machine with mass m1 0,2 kg and m2 0,22 kg. This experiment was done at  heights of 0,3  m, 0,4 m, 0,5 m, 0,6 m, 0,7 m, and 0,8 m, respectively.   The experiment results were compared to the results of the same experiment but using a stopwatch instead of the automatic timer. Both of the experiments, using the automatic timer and the stopwatch are compared to the theoretical calculation. The results showed that the error percentage using the automatic timer ranged from  1,95 % -  4,34 %  while the error percentage using stopwatch ranged from  5,96% to 12,88%, respectively. It showed that the result using the automatic timer gave lower percentage of error than the result using the stopwatch.