Скачать или смотреть Acceleration in Circular Motion starring Giselle the Gazelle

Giselle creates and runs an experiment to determine the relationship between centripetal acceleration and speed for an object in circular motion at a constant radius. She then creates and runs an experiment to determine the relationship between centripetal acceleration and radius for a constant speed. The data are analyzed to determine the relationship between centripetal acceleration, speed and radius. It is demonstrated that centripetal acceleration is directed towards the center of the circle. If the speed of the object is changing then there is also a tangential acceleration which is tangent to the circle. The net acceleration is the vector sum of the centripetal acceleration and the tangential acceleration. The tangential acceleration is determined from the slope of a graph of speed vs. time.

0:00 Experiment #1: Relationship between centripetal acceleration and speed when the radius is constant.
2:46 Analysis of the data for Experiment #1.
5:26 Direction of centripetal acceleration.
8:56 Tangential acceleration and net acceleration.
11:28 Experiment #2: Relationship between centripetal acceleration and radius when speed is constant.
13:36 Analysis of the data for Experiemnt #2.
16:43 Summary of acceleration in circular motion.