<![CDATA[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.]]>
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