From the point of view of constructivist teaching, there is considerable consensus regarding the need to have a detailed image of students’ understanding of a physical phenomenon before it is formally studied. This must be taken into account when one is planning and implementing learning activities aimed at the acquisition of scientifically accepted knowledge. Indeed, many cognitive psychologists and constructivists have stated that people construct new knowledge based on what they already know and believe, even if parts of this knowledge and understanding, which we shall call ‘prior ideas’ or ‘misconceptions’, are not consistent with scientific conceptions (C¸ alik and Ayas 2005; Chang et al. 2007; Eshach and Schwartz 2006; Wittmann et al. 2003).