NTNUJAVA Virtual Physics Laboratory
Enjoy the fun of physics with simulations!
Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/
February 26, 2021, 12:31:41 am *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
   Home   Help Search Login Register  
"Talk and eat less, think and listen more." ...Wisdom
Google Bookmarks Yahoo My Web MSN Live Netscape Del.icio.us FURL Stumble Upon Delirious Ask FaceBook

Pages: [1]   Go Down
Author Topic: Free Fall 3D "Modeling Physics with Easy Java Simulations" by Wolfgang/Francisco  (Read 15643 times)
0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
Hero Member
Offline Offline

Posts: 1796


Embed this message
on: November 26, 2008, 04:00:29 pm » posted from:SINGAPORE,SINGAPORE,SINGAPORE

Free Fall 3D simulates the same physics as the 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. See the Free Fall model for a description of this model is implemented in Ejs.

Embed a running copy of this simulation

Embed a running copy link(show simulation in a popuped window)
Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
  • Please feel free to post your ideas about how to use the simulation for better teaching and learning.
  • Post questions to be asked to help students to think, to explore.
  • Upload worksheets as attached files to share with more users.
Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!

* freefall3d.PNG (37.04 KB, 1024x735 - viewed 700 times.)
« Last Edit: August 03, 2009, 10:19:49 am by lookang » Logged
Hero Member
Offline Offline

Posts: 1796


Embed this message
Reply #1 on: August 03, 2009, 10:18:08 am » posted from:SINGAPORE,SINGAPORE,SINGAPORE

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.  See:
"Modeling Physics with Easy Java Simulations" by Wolfgang Christian and Francisco Esquembre, The Physics Teacher, November 2007, 45 (Cool, pp. 475-480.
The Easy Java Simulations (EJS) manual can be downloaded from the ComPADRE Open Source Physics collection and from the Ejs website.
This simulation was created by Wolfgang Christian using the Easy Java Simulations (Ejs) modeling tool. You can examine and modify this simulation if you have Ejs installed by right-clicking within a plot and selecting "Open Ejs Model" from the pop-up menu.
Information about Ejs is available at: .

3D Navigation
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.

My input/contributions are
1. Event for ODE Evol Page is not working to my satisfaction but the codes is
if(vz>0) return 1;  // particle is not falling
//if (z>0) return 1;  // if particle z is greater than 0 , do nothing
return z-0.0; // change 0.0 to 0.5 for z =0.5 to action
note: the if z>0>) return 1; the number 0 cannot be changed to a positive number but works for negative ??

2. panel on left[/color][/b]

source code
download the *.jar for using the applet on standalone without internet connection.
Pages: [1]   Go Up
"Talk and eat less, think and listen more." ...Wisdom
Jump to:  

Related Topics
Subject Started by Replies Views Last post
When you step on the accelerator, the car "noses up"?
Fu-Kwun Hwang 0 15873 Last post April 08, 2005, 12:55:37 pm
by Fu-Kwun Hwang
how to make the symbol "alpha" appear as α in the java applet
Questions related to EJS
lookang 2 14308 Last post August 13, 2007, 07:48:56 am
by lookang
Free Fall Cartesian by Wolfgang Christian and Francisco Esquembre
Collaborative Community of EJS
lookang 3 9426 Last post January 05, 2019, 02:21:09 pm
by vivozi
Free Fall Cartesian with friction 2D Wolfgang Christian and Francisco Esquembre
Collaborative Community of EJS
lookang 1 6537 Last post January 05, 2019, 02:22:18 pm
by vivozi
please help me ,,, source code "java"
seemlave 2 8194 Last post January 02, 2021, 06:45:09 pm
by jacoboram550
Powered by MySQL Powered by PHP Powered by SMF 1.1.13 | SMF © 2006-2011, Simple Machines LLC Valid XHTML 1.0! Valid CSS!
Page created in 0.04 seconds with 23 queries.since 2011/06/15