*34%*:**Test of understanding of vectors: A reliable multiple-choice vector concept test***26%*:**Illuminations: Learning About Properties of Vectors and Vector Sums Using Dynamic Software***26%*:**Modular Approach to Physics: Vector Addition Practice - Three Vectors***26%*:**MIT Physics 8.02: Vector Fields Visualizations - Cross Product of Two Vectors***25%*:**Concept substitution: A teaching strategy for helping students disentangle related physics concepts***25%*:**Teaching the concepts of measurement: An example of a concept-based laboratory course***24%*:**Foundations 2: From Special to General***23%*:**GRTensorII home pages***23%*:**Concept-based problem solving: Making concepts the language of physics***23%*:**Students' difficulties with unit vectors and scalar multiplication of a vector***23%*:**Testing Studentsâ€™ Understanding of Vector Concepts***22%*:**Students' Conceptions About the Vector Characteristics of Three Physics Concepts***22%*:**Initial understanding of vector concepts among students in introductory physics courses***22%*:**Schematic concepts for schematic models of the real world: The Newtonian concept of force***22%*:**Investigation of Studentsâ€™ Preconceptions and Difficulties with the Vector Direction Concept at a Mexican University***22%*:**Vector Addition: Effect of the Context and Position of the Vectors***22%*:**A research-based approach to improving student understanding of the vector nature of kinematical concepts***21%*:**Introduction to Differential Geometry and General Relativity***20%*:**2-D Vector Field Simulation**