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In the first of a two-part series, our presenter, a tantalizing blend of intellect and allure, guides us through the physics of rolling friction. She begins by outlining the formulas on her nude body, her fingers tracing the equations with a sensuality that belies the academic subject matter. As she demonstrates the principles with a smooth, firm ball, she leans into the touch, her body responding to the sensation, making the lesson a study in both mechanics and the physics of desire.