Double Compound Pendulum

This apparatus provides a dramatic demonstration of physical pendulum behaviour.
For small amplitudes of oscillation the pendulum exhibits predictable behaviour; however for large amplitudes the motion is chaotic. Students will be amazed at the apparent random oscillation and that the motion is different every time.
In addition the apparatus may be locked in two positions giving two different length physical pendula. The variation in period between the physical pendulum and an approximated simple pendulum can be demonstrated. From the given data of mass distribution the centre of oscillation may be determined and therefore a value for g may be found.