*56%*:**A Cross-College Age Study of Science and Nonscience Students' Conceptions of Basic Astronomy Concepts in Preservice Training for High-School Teachers***56%*:**A cross-age study of senior high school students' conceptions of basic astronomy concepts***56%*:**A research-based approach to improving student understanding of the vector nature of kinematical concepts***55%*:**Investigation of Studentsâ€™ Preconceptions and Difficulties with the Vector Direction Concept at a Mexican University***55%*:**Students' difficulties with unit vectors and scalar multiplication of a vector***53%*:**University students' conceptions of basic astronomy concepts***50%*:**"After I gave students their prior knowledge" Pre-service teachers' conceptions of student prior knowledge***50%*:**Initial understanding of vector concepts among students in introductory physics courses***50%*:**Testing Studentsâ€™ Understanding of Vector Concepts***50%*:**Test of understanding of vectors: A reliable multiple-choice vector concept test***48%*:**A cross-age study of junior high school students' conceptions of basic astronomy concepts***48%*:**Studentsâ€™ Understanding of the Concepts of Vector Components and Vector Products***47%*:**Concept substitution: A teaching strategy for helping students disentangle related physics concepts***44%*:**An investigation of students' abilities in establishing relations between some physical concepts***44%*:**Students' conceptions of the second law of thermodynamics--an interpretive study***44%*:**The Concept Map as a Tool for the Collaborative Construction of Knowledge: A Microanalysis of High School Physics Students***44%*:**Modular Approach to Physics: Vector Addition Practice - Three Vectors***43%*:**Student Preconceptions about Vector Kinematics***42%*:**Students' operations with the weight concept**