
Room setup |

Photogate timer configuration |

Timer beam is tripped by small cylinder
(coaxial cable core) on string |

Thread string between small metal piece
and pendulum bracket; tighten thumb screw |

Instructors demo (front view) |

Instructors demo (side view) |

Configuration of clamps |

Knife-edge clamp holds the two
pendulum clamps together |

Hang pendula so that their center of mass
is aligned |

Pendula will swing in sync |

Setup, viewed from above |

Forces on bracket |