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 Newton's Universal Gravitation This web page, authored and curated by David P. Stern, provides information about Newton's theory of universal gravitation and some discussion of the history of Newton's work on this topic. Featured are a calculation for the orbital period of the moon and the formula for the force of gravity. Several links to source material on Newton and his work as well as a lesson plan for instructors are also... http://www.phy6.org/stargaze/Sgravity.htm
 The Way Things Fall This web page, authored and curated by David P. Stern, provides an introduction to the motion of objects due to gravity. Topics covered include free fall and acceleration due to gravity, with or without an initial velocity, and the effects of air resistance. Simple equations are integrated along with a short experiments related to Galileo's classic ramp experiment. A lesson plan for teachers is... http://www.phy6.org/stargaze/Sfall.htm
 Hyperphysics: Pendulum This webpage, from Hyperphysics, describes a pendulum and provides a formula for its period. The page includes a calculator to obtain the period from the pendulum's length and the acceleration of gravity. http://hyperphysics.phy-astr.gsu.edu/hbase/pend.html
 Falling Feather This site from the Exploratorium presents a demonstration showing that the acceleration of gravity is the same for different objects. The site contains a materials list, assembly instructions for creating the vacuum, and basic procedures for the demonstration. Also provided is an explanation of gravitation effects, freefall, and terminal velocity. http://www.exploratorium.edu/snacks/falling-feather
 Density and Buoyancy with Centrifugation In this activity, by the Concord Consortium's Molecular Literacy project, students "have an opportunity to explore the relationship between atomic mass, volume, and density, and relate these to the technique of centrifugation." The activity itself is a java-based interactive resource built upon the free, open source Molecular Workbench software. In the activity, students are allowed to explore... http://molit.concord.org/database/activities/246.html
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