Describing the motion in a vertical roller coaster loop requires a good understanding of Newton’s laws, vectors and energy transformation. This paper describes how first-year students try to make sense of force and acceleration in this example of non-uniform circular motion, which was part of a written exam. In addition to an analysis of the exam solutions by about 60 students, a group interview was performed a couple of weeks later with four students, who had all passed the exam. The interview allowed the students to reflect on assumptions made and information missed.

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Geological time is by many geoscience instructors considered a threshold concept for geoscience students, being a central concept for how we experience geosceince phenomena that takes place on a spatio-temporal scale ranging from micro (e.g. cloud formation) to macro (e.g. plate tectonics). If one wishes to understand geoscience phenomena that goes beyond human perception, one must move from the concrete toward the abstract—from experiencing a phenomenon with one’s senses toward an experience of the phenomenon that is based on an mind construct; we refer to such competency as disciplinary spatio-temporal competency (DSTC). The purpose of this study is to gain an understanding of how first-year students in a geoscience program in Sweden experience and represent the phenomenon of geological time, i.e. to capture their DSTC. Analyazing data from three semi-structured group interviews using a phenomenographic approach revealed how the students express geological time through their language, their gestures, and their visualizations. From the result in this study, including four qualitatively different themes, or categories of description, it is possible to conclude that the students' way of expressing geological time give rise to exciting interpretations and we believe that these expressions can provide information also about how students experience (and learn about) geological time. We report that through students’ illustrations and discussions, students experience geological time as something more than a static one-dimensional straight line. The data analysis shows that students connect geological time with spatio-temporal aspects from various geosientific phenomena, one example of such an dynamic description of geological time is “One simply fills it with more information” indicating that the students experience geological time as two-dimensional (space and time).

Programming as a tool to be used for analyzing and exploring physics in an educational setting offers an unprecedented opportunity for the students to create and explore their own semiotic resources. Students may use programming to create and explore different models of physical systems. In this study a small group of upper secondary education students participated in a workshop where they learned to program physics simulations and to create their own models to implement using the programming language Python. Results from the study shows that upper secondary education students are able to create their own models of physical systems and implement them into code. The implemented models were models of hanging cloth and heat diffusion. Results were obtained by analyzing video and audio recordings of the students through the lens of social semiotics.