Free Fall 3D
The Free Fall 3D model simulates the same physics as the 2D Free Fall model but with a 3D View of the model's data. The ball falls with constant acceleration g=-9.8 m/s2 in the z direction. Click-dragging on the ball changes its height but leaves its velocity unchanged. The reset button stops the animation and sets the initial conditions to y=1.8 and vy=0.
The Free Fall 3D model is a designed to teach EJS modeling. Right click within the simulation to examine this model in the EJS modeling and authoring tool.
- "Modeling Physics with Easy Java Simulations" by Wolfgang Christian and Francisco Esquembre, The Physics Teacher, November 2007, 45 (8), pp. 475-480.
- The Easy Java Simulations (EJS) documentation can be downloaded from the ComPADRE Open Source Physics collection. W. Christian and F. Esquembre, in Modeling Science: From Free Fall to Chaos (2008), WWW Document, (http://www.compadre.org/osp/items/detail.cfm?ID=7306).
- A video tutorial that will help you get started using Easy Java Simulations to create computer simulations. See: L. Engelhardt, Introduction to EJS Video Tutorial (2010), WWW Document, (http://www.compadre.org/OSP/items/detail.cfm?ID=10316).
The Free Fall 3D model was created by Wolfgang Christian using version 4.3 of the Easy Java Simulations (EJS) authoring and modeling tool. You can examine and modify a compiled EJS model if you run the program by double clicking on the model's jar file. Right-click within the running program and select "Open EJS Model" from the pop-up menu to copy the model's XML description into EJS. You must, of course, have EJS installed on your computer.
The model's 3D view has many built in features that can be accessed as the program is running.
- Left-button click-dragging on the particle changes its position.
- Left-button click-dragging on an empty regions rotates the view.
- Left-button shift-click-dragging zooms in and out.
- Left-button control-click-dragging translates (pans) the view.
- Left-button alt-click-dragging displays a 3D cursor on the scene (if the panel is Enabled).
It the x, y or z key is pressed during a mouse action, the actions affects only this coordinate. Note also that these actions are are modified if the 3D view is projected onto a 2D plane.
Right-clicking within a 3D view displays a popup menu as shown below.
|with best with||Chrome||Chrome||Chrome||Chrome|
|support full-screen?||Yes. Chrome/Opera No. Firefox/ Samsung Internet||Not yet||Yes||Yes|
Wolfgang Christian; Loo Kang Wee; Francisco Esquembre
Sample Learning Goals
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