This experiment uses a conical pendulum to familiarize us with dynamic equilibrium in rotational motion. In this investigation, we will identify the free body diagram of a horizontally whirling object and see how it lifts as its speed goes up. The lift apparently dees the downward pull of gravity but we will see how a delicate balance of forces allows the object to swirl at a certain lift angle. As the speed of the object changes, the forces adapt and preserve the delicate balance. Eventually, this apparatus becomes a really nice demonstration of the interplay of geometry, vectors, forces, and equilibrium. This experiment recreates the mental problem in Paul Nahin's beautiful book, "In Praise of Simple Physics" and is one of the author's methods to determine the value of g.
|Software Code||Arduino code for speed control of stepper motor|
|Sample Results||Finding the value of “g”|
|Hardware Manual||Circuit diagram|
|Version||January 25, 2021 Version 2021-1|
Further Readings and References
- Measure gravity in your garage In Praise of Simple Physics , Paul J. Nahin, 203-207 , (2016).