Demos by PIRA

3A10 Pendula


  3A10.10Ball on string mounts on blackboard and pivots on lower rod.
  3A10.10Simple pendulum: Ball on a string.
  3A10.14Four pendulums on rod: Same mass, different lengths.
  3A10.17Four pendulums on rod: Same length, different masses.
  3A10.30Torsion pendulum with removable weights.

3A20 Springs & Oscillators


  3A20.10Mass on a spring.
  3A20.60Ball rolling in a spherical dish on OHP.

3A15 Physical Pendula


  3A15.20Physical pendulum: Steel bar with two pivot points.
  3A15.50"Sweet Spot": Meterstick pivot point changes with point struck.

3A40 Simple Harmonic Motion


  3A40.20Ball on turntable rotates beneath synchronized pendulum .

3A50 Damped Oscillators


  3A50.10Large damped oscillator (mass on spring) with various damping disks.

3A60 Driven Mechanical Resonance


  3A60.10Film : "Tacoma Narrows bridge collapse",silent, 4 min.
  3A60.24Driven oscillations in a multiple spring-mass system.
  3A60.40Driven harmonic oscillator: Motor driven mass on spring.
  3A60.50Unbalanced spinning wheel vibrates spring steel reeds.
  3A60.50Set of three coupled inverted pendulums on wood base.
  3A60.55Clock spring oscillator: Electrically driven and damped.
  3A60.60Inverted pendulum.

3A70 Coupled Oscillations


  3A70.10Wilberforce pendulum: Oscillates between rotation and up-down.
  3A70.20Two pendulums on a frame of flexible steel.
  3A70.25Two large pendulums coupled with spring.
  3A70.35Two balls hung on the same string, one in middle, one at the end.

3A75 Normal Modes


3A80 Lissajous Figures


  3A80.21Transparencies: Lissajous figures for OHP.
  3A80.40Lissajous figures with laser and two signal generators.
  3A80.40Lissajous Figures created with a two tuning forks with mirrors

3A95 Non-Linear Systems


  3A95.52Chaotic pendulum.