Uniform Circular Motion Practice

Level road / turntable: static friction is the only horizontal force, so f s = mv²/r and f s ≤ μN = μmg. Max speed: v = √(μgr), and mass cancels.
Gravitron: the wall’s normal force points to the center (N = mv²/r) and friction holds you up (f = mg). You stay up if μN ≥ mg.
String/tension: the tension supplies the inward force.

AP Physics C fundamentals · randomized problems, so every try is new. Use g = 10 m/s². Answers within 2% are accepted.

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Tip: for scientific notation type e.g. 4.22e7