Conservation of angular momentum

Conservation of angular momentum means that if no external forces act on a spinning or rotating object, its angular momentum stays the same. Think of a figure skater spinning: when she pulls her arms in, she spins faster; when she extends them, she slows down. This happens because her total angular momentum remains constant, and changing her shape affects how her mass is distributed, altering her rotation speed. Essentially, unless something forces her to change, her rotational motion will stay consistent, preserving angular momentum just like how a spinning ice skater maintains her spin without external interruptions.