The document discusses the simple harmonic motion of a mass on a spring. It states that the resonant frequency of the mass-spring system is determined by the mass and spring constant. The mass will trace out a sinusoidal pattern of motion as potential and kinetic energy are transformed between each other while the total energy remains constant. The system acts as a simple harmonic oscillator with one resonant frequency.

1. Oscillations and Waves Topic 4.2 Energy changes during SHM

6. Potential energy At extension x:

7. Kinetic energy At extension x:

8. Total energy Total energy