1. Many pendulums used in clocks are made of a thin metal bar with a very thin (in the plane of oscillation) adjustable bob.
a) Why the emphasis on a thin bar and bob?
b) for what reasons would the bob be moved up or down the bar?
2. A young child sits on a playground swing and swings back and forth with a particular period. An adult sits on the same swing swings back and forth with a particular period. Explain why this occurs even though the length of the swing does not change.
3. What would happen to the period of the swing if the child were to stand rather than sit on the swing?