*63%*:**Addressing Students' Difficulties in Understanding Two Different Expressions of Gravitational Potential Energy (I): mgh & -GMm/r***58%*:**Student reasoning about electrostatic and gravitational potential energy: An exploratory study with interdisciplinary consequences***54%*:**Teaching gravitational potential energy: Student interaction with surface manipulatives***50%*:**Student Understanding Of Gravitational Potential Energy And The Motion Of Bodies In A Gravitational Field***45%*:**Examining student ability to interpret and use potential energy diagrams for classical systems***44%*:**A Survey of Israeli Physics Students' Conceptions of Energy in Pre-Service Training for High School Teachers***42%*:**Student difficulties with finding the corrections to the energy spectrum of the hydrogen atom for the strong and weak field Zeeman effects using degenerate perturbation theory***42%*:**Student difficulties with the corrections to the energy spectrum of the hydrogen atom for the intermediate field Zeeman effect***42%*:**Student difficulties with finding the fine structure corrections to the energy spectrum of the hydrogen atom using degenerate perturbation theory***41%*:**Investigating the Relationship Between Student Difficulties with the Concept of Electric Potential and the Concept of Rate of Change***41%*:**"After I gave students their prior knowledge" Pre-service teachers' conceptions of student prior knowledge***40%*:**Preparing future teachers to anticipate student difficulties in physics in a graduate-level course in physics, pedagogy, and education research***36%*:**The Role of Affect in Sustaining Teachers' Attention and Responsiveness to Student Thinking***35%*:**Improving studentsâ€™ understanding of quantum measurement. I. Investigation of difficulties***35%*:**Observations on student difficulties with mathematics in upper-division electricity and magnetism***35%*:**Students' difficulties with integration in electricity***35%*:**Exploring Student Difficulties with Buoyancy***35%*:**Student difficulties with complex numbers***35%*:**Student difficulties with representations of quantum operators corresponding to observables**