Stable Equilibrium and Atomic Oscillation

Stable equilibrium is a key idea in oscillation. When an object sits at a stable equilibrium point, a small push moves it away, but it then tends to oscillate around that point. If the equilibrium point is unstable, a slight disturbance will not bring the object back.

The transcript also describe...

Consider a rocking chair oscillating back and forth, executing simple harmonic motion. The equilibrium position is the midpoint of the oscillation, where the net force is balanced.

For instance, a ball undergoing simple harmonic motion inside a ring oscillates around the equilibrium position due to the restoring force. When the ball comes...