This study aimed to investigate Cambodian high school students' understanding of the parabolic trajectory of a projectile, learned by the inquiry-based learning (IBL) approach, using the model analysis technique. An artificial car was set up to be applied in the investigation step of the IBL approach. The car was driven by spring force on a low friction wooden track and released a marble with a parabolic trajectory observed by the students. The study was conducted in three medium-sized high schools located in cities in Cambodia, with 204 students participating. The results revealed an average normalized gain at a medium level ( = 0.31±0.03sd). The model estimation of the model analysis technique displayed a small shift of model points before and after the instruction and remained in the mixed model region.
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