## Materials Similar to *Students' difficulties with unit vectors and scalar multiplication of a vector*

*52%*:**Test of understanding of vectors: A reliable multiple-choice vector concept test***51%*:**Vector Addition: Effect of the Context and Position of the Vectors***50%*:**Investigation of Studentsâ€™ Preconceptions and Difficulties with the Vector Direction Concept at a Mexican University***49%*:**Students' Difficulties in Interpreting the Torque Vector in a Physical Situation***44%*:**Testing Studentsâ€™ Understanding of Vector Concepts***44%*:**Student difficulties with quantum states while translating state vectors in Dirac notation to wave functions in position and momentum representations***44%*:**Student understanding of unit vectors and coordinate systems beyond cartesian coordinates in upper division physics courses***41%*:**Comparing Student Use of Mathematical and Physical Vector Representations***41%*:**Maximum Likelihood Estimation (MLE) of studentsâ€™ understanding of vector subtraction***41%*:**Student Difficulties with Trigonometric Vector Components Persist in Multiple Student Populations***40%*:**A research-based approach to improving student understanding of the vector nature of kinematical concepts***39%*:**Initial understanding of vector concepts among students in introductory physics courses***39%*:**Writing Position Vectors in 3-d Space: A Student Difficulty With Spherical Unit Vectors in Intermediate E&M***38%*:**Student Preconceptions about Vector Kinematics***38%*:**Student Reasoning about the Divergence of a Vector Field***38%*:**Algebra-Based Students & Vectors: Assessing Physical Understanding in Arrow vs ijk**