⏱️ Simple Pendulum

📖 The Physics

A simple pendulum swings back and forth because gravity always pulls the bob toward the lowest point. Pull it aside and gravity acts like a restoring force, tugging it back; it overshoots, and the cycle repeats.

For small angles this becomes simple harmonic motion, and the time for one full swing (the period) depends only on the length and gravity — not the mass of the bob.

Make the string longer and the swing gets slower (larger T). Increase gravity and it speeds up. Notice the mass of the bob never appears in the formula.