1. Gravity: When you pull the pendulum to one side, you are storing potential energy. Gravity pulls the pendulum bob downwards, converting this potential energy into kinetic energy, causing it to swing downwards.
2. Inertia: As the bob swings downwards, its momentum carries it past the resting point. Inertia, the tendency of an object to resist changes in its motion, keeps the bob moving even though gravity is pulling it back towards the center.
3. Back and Forth: This momentum carries the bob upwards on the other side, slowing down as gravity pulls it back towards the center. The process repeats, resulting in the pendulum's back and forth motion.
Factors Affecting the Motion:
* Length of the String: A longer pendulum takes longer to complete a swing (has a longer period).
* Mass of the Bob: The mass of the bob affects the pendulum's period slightly, but not significantly.
* Air Resistance: Air resistance slows down the pendulum's motion over time, causing it to eventually stop.
Key Point: The pendulum's motion is an example of simple harmonic motion, where the restoring force (gravity) is proportional to the displacement from the equilibrium position (center). This is why the pendulum swings back and forth in a regular, predictable pattern.
