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Questions for Discussion: Defy Gravity! Centripetal Force
What is the problem these kids are trying to solve? How does "centripetal force" keep the ball from immediately falling out of each pitcher? If the ball doesn't fall out (as in the second demonstration with the wide body pitcher), even though gravity is pulling it down, there must be an upward force acting on it. Where is that force coming from? Describe a problem from everyday life that is similar to this situation.
