The EJS Newton's Mountain JS model illustrates the motion of a projectile launched from the top of a VERY tall mountain on Earth. The diagram shown in the simulation is taken from Newton's A Treatise on the System of the World, which he wrote after the Principia, but the basic idea is found in the Principia itself. Newton concluded that a projectile launched horizontally with sufficient speed would orbit Earth rather than crashing to Earth's surface. Thus the motion of a projectile fired on Earth was not qualitatively different from that of the moon orbiting Earth.
EJS Newton's Mountain JS Model was created using the Easy Java Simulations (EJS) modeling tool.
Timberlake, T., & Belloni, M. (2014). Newton's Mountain JS Model (Version 1.0) [Computer software]. Retrieved July 1, 2016, from http://www.compadre.org/Repository/document/ServeFile.cfm?ID=13106&DocID=3648
%0 Computer Program %A Timberlake, Todd %A Belloni, Mario %D January 5, 2014 %T Newton's Mountain JS Model %7 1.0 %8 January 5, 2014 %U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=13106&DocID=3648
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