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Article
Story Behind the Science

Story Behind the Science: Pendulum Motion, Time, and Shape of Earth [Pdf]

For Students 9th - 10th
Article outlining the scientific history behind the evolution of theories about measuring time based on the movement of a pendulum, and about how gravity would impact a pendulum's movement depending on one's proximity to the Earth's...
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Article
Story Behind the Science

Story Behind the Science: Pendulum Motion [Pdf]

For Students 9th - 10th
The history of the pendulum and its importance both in timekeeping, and in how timekeeping was used to solve other problems, such as determining longitude on a map.
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Interactive
American Association of Physics Teachers

Com Padre Digital Library: Open Source Physics: Swinging Atwood's Machine Model

For Teachers 9th - 10th
Variation on the standard Atwood's Machine model, where one hanging mass swings like a pendulum and the other remains stationary. Manipulate the conditions and observe the results.