Info

A mass at the end of a string. (For dramatic effect, one could use the 50 lbs. pendulum of 1M40.1 Large Pendulum and Nose)

Parts List

Pole Assembly with plumb bob in A. Mechanics, 1B

Relevant Simulation

Demo Example:

Demo Example (Extra Mass):

From Boston University

Other Information

PIRA site
Set of Pendula with Different Masses
Set of Pendula with Lengths in a Predetermined Ratio

Real-Life Examples

Errors in clocks point to gravity not being uniform on the earth's surface

More Advanced Reading

Animation of small angle approximation breaking down from Penn State