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Large amplitude pendulums are often ignored by introductory physics classes even though students notice deviations from the small angle approximation during physics labs. Using Blockly coding built into PASCO software, students can create models of the motion of a large amplitude pendulum from basic physics principles. The new PASCO scientific Meter Stick Torque Set coupled with rotary sensors and photogates allows for accurate measurement of angular position, angular velocity, and period. This enables students to compare their models to direct measurements to test and refine them. Methods to predict and measure the period of a meter stick oscillating about its end will be demonstrated. Code to predict the motion of the pendulum as a function of time will be shown and the results compared to measurements. A procedure for the experimental derivation of the parallel axis theorem using this equipment also will be shared.


AAPT SM 21

Modeling and Measuring Characteristics of a Large Amplitude Physical Pendulum

large amplitude pendulum

modeling

coding

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Modeling and Measuring Characteristics of a Large Amplitude Physical Pendulum

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