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A tetherball tension, Earth's gravity pulling on the Moon, and friction between roller skates and a rink floor are all given as examples of what kind of force?
AExamples of a centripetal force
BExamples of a fictitious force
CExamples of a nonconservative force
DExamples of a normal force
Answer & Solution
Correct answer: A. Examples of a centripetal force
1. A centripetal force is any net force that causes uniform circular motion, and it can be supplied by many different physical forces.
2. Tension in a tether ball rope, Earth's gravity on the Moon, and friction between skates and a rink floor are all listed as forces that can play this centripetal role.
3. None of these examples is a fictitious force, since each has a real, identifiable physical origin.
4. They are also not examples chosen to illustrate normal forces or nonconservative forces specifically, since the point being made is about what can supply a centripetal force.
_Source: OpenStax College Physics (CC BY 4.0), Ch 6 "Uniform Circular Motion and Gravitation", section 6.3 Centripetal Force_
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