Learning Cycle on the Nature and Requirements of Circular Motion

David and Alan hit a ball so that it travels in a circle: Observational Experiment
Eugenia skates in a circle: Observational Experiment
Ball constrained to a ring: Qualitative Testing Experiment
Ball on a string: Testing Experiment
Skate and grab: Qualitative Testing Experiment
Pendulum Suspended from Spring Scale: Testing Experiment
Whirlygig: Quantitative Testing Experiment
Double Pulley Pendulum: Application Experiment
Coin on Rotating LP: Application Experiment