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AP Physics C: Mechanics
A simple pendulum consists of a small mass (called bob) suspended from a fixed point by a string or rod. It undergoes periodic motion, swinging back and forth under the influence of gravity.
The period of a simple pendulum is the time taken for one complete oscillation (back and forth) or cycle.
Length: The length of a simple pendulum refers to the distance between the point of suspension and the center of mass of its bob.
Oscillation: Oscillation refers to repetitive motion around an equilibrium position, where an object moves back and forth between two extreme points.