Sport videos (i.e., Sport videos):
High cal ones:
1. World Record Figure Skating Spin | 0:16: Natalia Kanounnikova with world record figure skating spin. She pulls her arms in reducing her rotational inertia, but since angular momentum L_z is being conserved approximately by low torque τ_z about her body z axis, her angular velocity ω must increase to conserve said angular momentum L_z approximately. In protoplanetary disk formation, the inspiraling molecular cloud speeds up its rotation for the same reason: conservation of angular momentum as rotational inertia decreases. Good for the classroom.
2. OpenStax: Angular Momentum V2: Physics Concept Trailer: Figure skater spins | 1:15 : How a figure skater speeds up figure skater spin while conserving angular momentum by decreasing rotational inertia. Automatic Jump to 0:29. Good for the classroom.
Low cal ones:
Local file: local link: sport_videos.html.
File: Sport file: sport_videos.html.