*54%*:**Context Rich Problems Online Archives: Conservation of Energy and Conservation of Momentum***50%*:**Modeling Physics.org: Qualitative Energy Storage and Conservation with Bar Graphs***44%*:**Helping students develop an understanding of Archimedes' principle. I. Research on student understanding***44%*:**Modeling Physics.org: Quantitative Energy Calculations & Energy Conservation***44%*:**How do students in an innovative principle-based mechanics course understand energy concepts?***43%*:**Concord Consortium: Atoms and Conservation of Energy***42%*:**Conservation of Energy***42%*:**Students' Conceptual Knowledge of Energy and Momentum***42%*:**Changes in studentsâ€™ problem-solving strategies in a course that includes context-rich, multifaceted problems***42%*:**The impact of problem-based learning on engineering studentsâ€™ beliefs about physics and conceptual understanding of energy and momentum***41%*:**Assessing student expertise in introductory physics with isomorphic problems. II. Effect of some potential factors on problem solving and transfer***41%*:**Assessing student expertise in introductory physics with isomorphic problems. I. Performance on nonintuitive problem pair from introductory physics***41%*:**Matter & Interactions 3rd Ed. Practice Problems: The Energy Principle***40%*:**Effect of Problem Solutions on Students' Reasoning Patterns on Conceptual Physics Problems***40%*:**Synthesis problems: role of mathematical complexity in students' problem solving strategies***39%*:**Student Learning In Upper-Level Thermal Physics: Comparisons And Contrasts With Students In Introductory Courses***38%*:**Modeling Physics.org: Energy Pie Charts Worksheet***38%*:**Problem Based Learning: Bungee Jumping***38%*:**Rocket Science: Using Conservation of Energy to Predict Max Height**