摘要：This study aims to analyze the students’ understanding of motion in straight line
concepts and their difficulties after the learning process. The research method is a
mixed method with an embedded experimental design. The research was
conducted in one of the public senior high schools in Malang City Indonesia with
34 students consisting of 20 women and 14 men. The research instrument was used
reasoned multiple-choice questions with a reliability of 0.814. The results showed
that integrated Formative E-Assessment in modeling instruction learning
significantly improved students' understanding of concepts with N-gain = 0.41 and
d effect size = 1.902. Found some difficulties experienced by students after
learning takes place, among others, in understanding the graph of the position and
speed of time. The combination of modeling instruction with e-formative
assessment can be an alternative to improve students’ understanding of motion in
straight line.
关键词：understanding of physics concepts; modeling instruction; formative eassessment;
straight line motion; e;assessment; instruction
