IB DP Physics: HL复习笔记9.1.2 Energy Changes in SHM

Energy Changes in SHM

  • During simple harmonic motion, energy is constantly exchanged between two forms:
    • Kinetic energy
    • Potential energy
  • The potential energy could be in the form of:
    • Gravitational potential energy (for a pendulum)
    • Elastic potential energy (for a horizontal mass on a spring)
    • Or both (for a vertical mass on a spring)
  • The speed of an oscillator is at a maximum when displacement x = 0, so:

The kinetic energy of an oscillator is at a maximum when the displacement is zero

  • Therefore, the kinetic energy is zero at maximum displacement x = x0, so:

The potential energy of an oscillator is at a maximum when the displacement (both positive and negative) is at a maximum,