Development and Validation of Diagnostic Instrument to Identify Student Misconceptions in Vector Material

Arrafikar Rizqia Firdaus (Universitas Sultan Ageng Tirtayasa)
Elza Wulandarie (Universitas Sultan Ageng Tirtayasa)
Mira Cantika (Universitas Sultan Ageng Tirtayasa)
Tresna Galih Sukma Suryana (Universitas Sultan Ageng Tirtayasa)

Journal of Innovative Physics Education Research
Vol. 1 No. 1 (2025): Journal of Innovative Physics Education Research (April)

This study aims to develop and validate a web-based diagnostic instrument to detect students' misconceptions on vector material, including the concepts of vector magnitude, vector components, resultant, and vector displacement. The research was conducted using a quantitative research design, involving 30 students of class XI IPA 3 SMA Negeri 1 Padarincang. The research process includes instrument development, expert validation, limited trial, and data analysis. The results showed that the instrument had adequate reliability and validity, with KR-20 reliability of 0.848 (high category). The instrument is effective in identifying misconceptions, especially on the concepts of resultant and vector displacement. This article contributes to the development of diagnostic-based physics learning evaluation.