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Merry Mixer Ride Model
Michael R. Gallis
Anyone who has ridden "The Scrambler" ride at an amusement park will be familiar with the system depicted in this simulation. The Merry Mixer Ride Model shows the interaction of two superimposed circular motions. The main frame of the ride rotates in one direction, while a second rotation at the ends of the frame arms carries the riders in an additional circular motion, usually in the opposite direction. Students can control the two rotation rates and the radii of the two orbits. Horizontal force vectors can be displayed, as well as a graph of the g-force on the rider vs. time. What parameters will give the maximum acceleration to the riders? What parameters will cause riders to crash into the center pole? The simulation is formatted in 3D to allow users to change their visual perspective.
The Merry Mixer Ride 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 jar file will run the program if Java is installed.
Please note that this resource requires
at least version 1.5 of
Merry Mixer Ride Source Code
The source code zip archive contains an XML representation of the Merry Mixer Ride Model. Unzip this archive in your Ejs workspace to compile and run this… more... download 190kb .zip
Last Modified: January 15, 2012
6-8: 4F/M3b. If a force acts towards a single center, the object's path may curve into an orbit around the center.
11. Common Themes
6-8: 11A/M2. Thinking about things as systems means looking for how every part relates to others. The output from one part of a system (which can include material, energy, or information) can become the input to other parts. Such feedback can serve to control what goes on in the system as a whole.
9-12: 11A/H2. Understanding how things work and designing solutions to problems of almost any kind can be facilitated by systems analysis. In defining a system, it is important to specify its boundaries and subsystems, indicate its relation to other systems, and identify what its input and output are expected to be.
6-8: 11B/M4. Simulations are often useful in modeling events and processes.
9-12: 11B/H2. Computers have greatly improved the power and use of mathematical models by performing computations that are very long, very complicated, or repetitive. Therefore, computers can reveal the consequences of applying complex rules or of changing the rules. The graphic capabilities of computers make them useful in the design and simulated testing of devices and structures and in the simulation of complicated processes.
9-12: 11B/H3. The usefulness of a model can be tested by comparing its predictions to actual observations in the real world. But a close match does not necessarily mean that other models would not work equally well or better.
%0 Computer Program %A Gallis, Michael %D January 9, 2012 %T Merry Mixer Ride Model %8 January 9, 2012 %U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=11642&DocID=2531
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