Article
Khan Academy

Khan Academy: Trig and Forces: The Pendulum

For Students 9th - 10th
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.
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.
Article
Rice University

Rice University: Galileo's Pendulum Experiments

For Students 9th - 10th
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.
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...
Article
Famous Scientists

Famous Scientists: Christiaan Huygens

For Students 9th - 10th
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...
Article
A&E Television

History.com: A Timeline of Us Cuba Relations

For Students 9th - 10th
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.

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