Bifilar And Trifilar Apparatus
Product Code : EL-AMLE-10616
Quick Answer:
The Bifilar and Trifilar Apparatus is a wall-mounted experimental setup used to study two classic modes of pendulum motion and to determine the moment of inertia of a test body. In its bifilar configuration, the body is suspended on two threads and oscillates in a purely translational plane without rotation, behaving as a mathematical pendulum; in its trifilar configuration, the body is suspended on three threads and set into torsional vibration, from which the moment of inertia can be calculated using the measured oscillation period. A beam, a cylinder, or a circular ring can be used as the pendulum body, and the thread length is adjustable through clamping devices to vary the oscillation period.
Principle of Operation:
In a bifilar suspension, the pendulum body is suspended over two threads and oscillates in a plane purely translationally, without rotation; this kind of pendulum can be considered a mathematical pendulum.
In a trifilar suspension with three threads, the pendulum body is set into torsional vibration, which can be used to determine the moment of inertia experimentally. A beam, a cylinder, or a circular ring is used as the pendulum body, and the length of the threads can be adjusted using clamping devices; the moments of inertia of the pendulum body are calculated from the measured oscillation period, which can itself be varied by changing the thread length.
Features:
Ideal mathematical pendulum can be demonstrated.
Moment of inertia in an experiment on a rotary pendulum.
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Last Updated: September 2026
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