• A mass bobbing on a spring and a spot on a rotating wheel are both shown to be examples of simple harmonic motion.
  • The RPM of the wheel can be adjusted to match the period of the mass on the spring.
  • A sideways view can be shadow projected onto a screen to make the effect more obvious.









         (clamp rotator to table)
         (use clamping stand for mass and spring)
         (use OHP to shadow project)


  • RPM can be varied with speed control knob.






         (with 100 g mass and 5 cm spring, set speed to ~280 RPM)
         (explain function of RPM/rev button)

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