Ejs Open Source Rocket Physics Java Applet Model

[lookang]

Ejs Open Source Rocket Physics Java Applet Model by lookang, based on assignment given by Larry Engelhardt
built to share with Hillgrove Secondary
Broadening learning horizons through Flight and Aerospace.

Rocket Launch - Project Template

This is an incomplete template for the "Modeling a Rocket Launch with Gravity and Air Resistance" project. Modify this template to complete the project as described in the PDF document available at http://www.compadre.org/osp/items/detail.cfm?ID=11294.

completed by lookang for sharing with Hillgrove Secondary School
for the Broadening Learning horizons through flight and aerospace niche area.

Embed a running copy of this simulation
<applet code='users.sgeducation.lookang.rocketTemplate.RocketTemplatewee_pkg.RocketTemplateweeApplet.class' archive='http://www.phy.ntnu.edu.tw/ntnujava/ejsuser/14019/ejs_RocketTemplatewee.jar' name='RocketTemplatewee9947' id='RocketTemplatewee9947' width='687' height='546' mayscript=true><param name='draggable' value='true'></applet>
Embed a running copy link(show simulation in a popuped window)
<a href='http://www.phy.ntnu.edu.tw/ntnujava/msg.php?smfejs=9947' target='smfejs'>Run simulation</a>

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!

[lookang]

changes made by lookang:

assignment completed by lookang following Larry Engelhardt useful PDF
made visibility of the flame by adding ( t>0) && ( burnRate>0)
added thrust = (burnRate*v)
added analytic solution
added gravity g = gs/((1+y/Rearth)*(1+y/Rearth));
added gravityforce =-(m+mFuel)*g;
added air resistance in fixed relationship
if (y<44307){
 Temperature= Temperatureo- L*y;
 Pressure = Pressureo*Math.pow((Temperature/Temperatureo),(g*Molarmassair/R*L*y));// need this to avoid bug in calculation when Pressure <0
}
else if (y>44307){
  Temperature=0.0065;
  Pressure = 0.001;
  }

densityair=Pressure*Molarmassair/(R*Temperature);
DragForce = 0.5*densityair*area*Cd*vy*vy;
added scale to draw forces on rocket world view
added bottom panel as in my usual layout
added timer

enjoy!