Pendulum Theory; how to improve accuracy to determine g

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SUMMARY

The discussion focuses on using a pendulum to accurately determine the acceleration due to gravity (g). The method involves setting up a pendulum with a 50g mass and measuring its length at 90cm, then timing 10 oscillations at a 30-degree angle. To enhance accuracy, participants suggest repeating the experiment multiple times with varying string lengths, specifically shortening the string by 5cm each time. This systematic approach minimizes errors and improves the reliability of the results.

PREREQUISITES
  • Understanding of pendulum mechanics
  • Familiarity with basic measurement tools like a metre rule
  • Knowledge of timing techniques using a stopwatch
  • Concept of oscillation and its significance in physics experiments
NEXT STEPS
  • Research the impact of string length on pendulum period
  • Explore advanced timing techniques to reduce human error
  • Learn about the effects of air resistance on pendulum motion
  • Investigate the use of digital sensors for precise measurements in pendulum experiments
USEFUL FOR

Physics students, educators conducting experiments, and anyone interested in improving experimental accuracy in pendulum mechanics.

TaraMarshall
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Theory based;
Using a pendulum to determine g

Method:
1. Set up the retort stand and clamp on the edge of a desk. Tie on the string and adjust its length to about 90cm before attaching a 50g mass carrier.
2. Using the metre rule, carefully measure the length of the pendulum from the knot at its top to the base.
3. Set the pendulum swinging at a 30 degree angle and use the stopwatch to time 10 complete back and forth swings (oscillations)
4. Repeat steps 2 and 3 at least 5 times, after shortening the string by 5cm each time.


Question:
How does this method generally give very accurate results?
What could I do to improve the method of this experiment to make it more accurate?
 
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