How do I measure a the period of a bifilar pendulum?

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SUMMARY

The discussion focuses on measuring the period of a bifilar pendulum for a formal lab project. The experiment involves using a laser to reflect light at different angles to measure oscillation time. Participants suggest using a stopwatch to time multiple oscillations for improved accuracy, while also mentioning the use of a photogate for more precise measurements. The control variables include the distance between the strings and the initial angle of the rod.

PREREQUISITES
  • Understanding of bifilar pendulum mechanics
  • Familiarity with basic experimental design and control variables
  • Knowledge of timing methods, including stopwatch usage
  • Experience with photogate technology for motion measurement
NEXT STEPS
  • Research methods for measuring oscillation periods in pendulum experiments
  • Learn about the setup and calibration of photogates for precise timing
  • Explore data analysis techniques for plotting time vs. displacement
  • Investigate the effects of string length on pendulum amplitude and period
USEFUL FOR

Students conducting physics experiments, educators teaching pendulum dynamics, and researchers interested in experimental measurement techniques.

May29
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I have a formal lab due, and my idea is to use a bifilar pendulum, model its period using experimental data, and examine the effect of the length of the strings on the amplitude of the period.

For anyone unfamiliar with it, here is a picture of the pendulum. This is how I plan on setting up my experiment:
http://labs.physics.dur.ac.uk/level1/projects/images/gallery/img_5633.jpg

My control variables will be the distance between the strings and the angle the rod is turned to begin the oscillation. I plan on shining a laser at the end of the rod, which will reflect the light back at different angles. If I can measure the amount of time it takes to cross a distance, I can plot a time vs displacement/degrees from equilibrium position. But I'm not sure how I can accurately measure the time. I don't have the budget for expensive gadgets. Is there any way to do this?

Thanks for any help.
 
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If you just want the period, then you don't need to know detail of the entire motion.
You can use a stopwatch... time for, say, 10 oscillations and divide.
Need more accuracy, then time for more oscillations.

The gadget approach would use a photogate.
 

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