ANALYSIS AN INSTRUMENT FOR MEASURING THE MASTERY OF THIRD NEWTON'S LAW THROUGH RASCH MODEL APPROACH

Abstract

This study aims to analyze the characteristics instrument for measuring the mastery of Newton's third law. Model approach used is Rasch Model. The study involves 68 students participating in the lecture of multimedia in physics learning. The results of the analysis show that the instrument has a person reliability of 0.63 and item reliability of 0.92, with difficulty levels varying from low to high, and having no bias. This instrument is eligible to be used to measure Newton's rule of law.