Abstract
The purpose of this study is to determine high school teacher's awareness of students' naive conceptions about inertia. The students were asked to solve the "space ship problem". All of them had learned Newton's laws. Seven physics teachers were asked to predict the students' answers. "MIF" conceptions was included in students' answers. The teachers, as a group, identified the students' conceptions. But each teacher missed some conceptions. And they generally tended to estimate student's level of understanding of inertia too high.
