Cards (24)

  • What is the frequency of forced oscillations called?
    Driving frequency (f)
  • What is the natural frequency of an oscillating system?
    Frequency when oscillating freely
  • What happens when the driving frequency approaches the natural frequency?
    The system gains more energy
  • What is resonance defined as?
    Driving frequency equals natural frequency
  • How does pushing a child on a swing demonstrate resonance?
    Push matches swing's natural frequency
  • What occurs if the driving frequency does not match the natural frequency?
    Amplitude increases but less than at resonance
  • Why is energy transferred most efficiently at resonance?
    Driving frequency matches natural frequency
  • What is a resonance curve?
    Graph of driving frequency vs amplitude
  • What happens to amplitude when driving frequency is less than natural frequency?
    Amplitude of oscillations increases
  • What occurs at the peak of the resonance curve?
    Amplitude is at its maximum
  • What happens when driving frequency exceeds natural frequency?
    Amplitude of oscillations starts to decrease
  • How does damping affect resonance vibrations?
    Damping reduces amplitude of vibrations
  • What remains unchanged when damping is increased?
    Natural frequency of the oscillator
  • How does the resonance curve change with increased damping?
    Peak lowers, broadens, and shifts left
  • What does increased damping do to the sharpness of resonance?
    Reduces the sharpness of resonance
  • What can cause glass to smash due to resonance?
    High pitched sound wave at right frequency
  • How does a radio demonstrate resonance?
    Tuned to resonate with broadcast frequency
  • What mechanical system is commonly used to show resonance?
    Barton's pendulums
  • What happens when pendulum X is released in Barton's pendulums?
    It drives the other pendulums
  • Why does pendulum C have the largest amplitude in Barton's pendulums?
    Its natural frequency matches pendulum X
  • How are the phases of oscillations related to the lengths of pendulums?
    Shorter lengths are in phase, longer are out
  • What phase is pendulum C with length L relative to the driver?
    0.5π out of phase
  • What phase are pendulums B and A with lengths greater than L?
    π out of phase
  • What phase are pendulums E and D with lengths less than L?
    In phase