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Khan Academy
Khan Academy: Trig and Forces: The Pendulum
Using Newton's Laws of motion to calculate the acceleration of a pendulum as well as to compute and draw its position along the swing and move about the screen in a computationally based graphic system.
Story Behind the Science
Story Behind the Science: Pendulum Motion [Pdf]
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.
Rice University
Rice University: Galileo's Pendulum Experiments
This site from The Galileo Project of the Rice University provides a great look into the pendulum experimens of Galileo. Contains first-hand writings and examples of experiments along with links to additional information.
Story Behind the Science
Story Behind the Science: Pendulum Motion, Time, and Shape of Earth [Pdf]
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...
Famous Scientists
Famous Scientists: Christiaan Huygens
Learn about prominent Dutch mathematician and scientist, Christiaan Huygens, whose work included early telescopic studies of the rings of Saturn and the discovery of its moon Titan, the invention of the pendulum clock, and other...
A&E Television
History.com: A Timeline of Us Cuba Relations
The United States and Cuba share a long, complex history -- first as allies and trade partners, and later as bitter ideological enemies. This timeline shows how closely entwined America and Cuba have been over the last two centuries.