The EJS Newton's Mountain 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. You can modify this simulation if you have EJS installed by right-clicking within the plot and selecting "Open Ejs Model" from the pop-up menu item.
EJS Newton's Mountain model was created using the Easy Java Simulations (EJS) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_astronomy_NewtonsMountain.jar file will run the program if Java is installed. EJS is a part of the Open Source Physics Project and is designed to make it easier to access, modify, and generate computer models. Additional EJS models for astronomy are available. They can be found by searching ComPADRE for Open Source Physics, OSP, or EJS.
Please note that this resource requires
at least version 1.5 of
Newton's Mountain Model Source Code
The source code zip archive contains an XML representation of the EJS Newton's Mountain Model. Unzip this archive in your EJS workspace to compile and run… more... download 178kb .zip
Published: August 18, 2009
%0 Computer Program %A Timberlake, Todd %D August 18, 2009 %T Newton's Mountain Model %7 1.0 %8 August 18, 2009 %U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=9391&DocID=1299
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a remixed version of the original version by Todd. remixed by lookang made sliders and fields conform to my design preference redo for SI units for closer to sg syllabus instead of arbitrary units originally made 22May2011 add earth picture add panel of x,y,vx,vy,ax,ay for calculating values to coincident with Earth data add trace instead of the older trail that can display older data rotate newton's diagram by 5 degree to coincident with x=0, instead of the older 0.1*R add time change to acceleration instead of force