This page features an animation of a skiier descending down a 58-meter slope. The first part of the animation depicts the changing ratio of potential-to-kinetic energy. At the end of the run, the skiier encounters unpacked snow and loses total mechanical energy to the dissipative force of friction. Bar graphs for W (Work) and TME (Total Mechanical Energy) illustrate the relationship between work and mechanical energy. This activity contains a full text discussion of each process as it occurs. It is part of The Physics Classroom, a comprehensive online tutorial written for high school physics students.