Beginners put the friction force at ( \mu_s N ) immediately. Experts check if the ladder is impending at both ends.
The problems above are archetypes. Solve them until the method becomes reflexive. Then modify them: add friction, change the geometry, add a spring. That is the difference between a contestant and a champion. Beginners put the friction force at ( \mu_s N ) immediately
This is a structural and strategic guide designed to be the for a high-level problem collection. It focuses on how to approach mechanics for the International Physics Olympiad (IPhO) and national qualifiers (USAPhO, Jaan Kalda style). change the geometry