In this article we investigated 4th, 6th, and 8th grade students' misconceptions about light, sight, vision, source of light and examined students' conceptual development of these concepts at different grade levels. Data collection was done using five two-tiered test questions with one open-ended question, an interview about concepts and a drawing…

This article is the first of a two-part review of research on children's and adults understanding of gravity and on how best to teach gravity concepts to students and teachers. This first article concerns free fall--how and why objects fall when they are dropped. The review begins with a brief historical sketch of how these ideas were developed in…

This is the second and final part of a review of educational research on children's ideas about gravity. The first part concerned students' understanding of how and why things fall. This article picks up the trail of research studies that address students' understanding of the more complex ideas of projectile motion and orbits and examines how the…

Misconceptions interfere with the formation of new insights and provide a faulty foundation. This causes difficulty in the learning of new materials. Therefore, effective teachers strive to know which misconceptions students have, and then develop a plan by which these suspected misconceptions can be corrected or averted. This paper reports on an…