Bar-Coupled Pendula

Purpose

To demonstrate a coupling resonance and to show normal modes.

Equipment

Bar coupled pendula, as pictured.

Images

g2-22

Description

By starting either pendulum in motion in the plane of the picture, one observes transfer of the motion between the two pendula. One can also produce the two normal modes: both pendula moving in phase, or the pendula moving out of phase.

References

J. Morris Blair, Laboratory Experiments Involving the Two-Mode Analysis of Coupled Oscillators, AJP 39, 555-557 (1971).