Lab 3 focused on investigating the relationship between the period of a pendulum and factors such as length and mass. The primary objective was to understand how these variables affect the pendulum’s motion and to use experimental data to calculate gravitational acceleration \( g \). The lab was divided into key parts: the first involved using a simple pendulum apparatus and a ruler to measure the length of the pendulum and determine how the period changes with length. The second part involved varying the mass of the bob to observe its effect on the period. We used a stopwatch to time the oscillations and compared the experimental results with theoretical predictions. The main goals were to develop accuracy in measurement, improve data analysis skills, and deepen our understanding of the principles of pendulum motion. These skills are crucial for conducting precise experiments and applying theoretical concepts in future physics labs.