Applets by Daniel Roth - Rotating Frame of Reference

(c) 2000 by Daniel Roth, FiPS, Department of Physics, University of Kaiserslautern, Germany

Java Applet

While moving over a rotating frame of reference, an object is leaving track marks on the rotating frame of reference.

Loading the Applet completely may take some time (~ 600kbyte), please wait until "Wait..." is no longer displayed. Thank you!


1 units = 10 cm
If you use this Applet frequently or if you are having ideas for further Applets, please send me an email. Thank you!  

Instructions

RPS =	rounds per second the rotating frame of reference should rotate with
alpha0 =	initial angle of movement of object [ ° ]
Vo =	initial speed of object [ m/s ]


The initial conditions can be chosen one of the following two ways:
 

• The rounds per second the rotating frame of reference should rotate can be changed by typing the desired value into the appropriate textbox and hitting ther return key afterwards.
• Initial velocity of the object can be set by typing the values of alpha0 and v0 into the appropriate text boxes and confirming with hitting the return key.
• Initial velocity of the object can be set by drawing the vector of initial velocity. To do this, click onto the frame of reference and drag the mouse until the initial velocity vector (displayed in blue) is the way you want it to be. While doing so, the relating alpha0 and v0 textboxes are updated.
• Initial position of the object can bee chosen by clicking onto the object (displayed as red filled circle) and dragging it to the desired position. While doing so, the position relative to the rotating frame of reference is displayed.

Click onto Start to start the simulation. A click onto Reset completely resets the simulation and cleans the output. Clicking onto Pause stops the simulation temporarily. To resume it, click onto Start again.

To go back to the list of Applets, click here: List of Applets by Daniel Roth

Notes

• Reasonable values for RPS are from 0.1 up to even 10 or more (try as much as you want).
• If you run the applet for the first time, just click onto Start after it has finished loading. You will then see a simulation run with default values of RPS, v0 and alpha0. Afterwards click onto Reset and try your own values. Please be aware, that clicking onto Reset does set the values of RPS, v0 and alpha0 to the default values but to the values of RPS = 0.1, v0 = 0 cm/s and alpha0 = 0°.
  
  Examples:
  
  

  RPS = 0.1 / v0 = 100 / alpha0 = 90

  RPS = 1.0 / v0 = 171 / alpha0 = 86

  RPS = 10.0 / v0 = 165 / alpha0 = 90

• This applet is a beta version, which means that there are known bugs: Low RPS (less than 1) and high initial velocity (more than 100) may cause some kind of crazy - and of course wrong! - track marks. I haven't seen this problem with higher RPS. I am trying to fix this bug, but it may take some time (I am pretty busy with other stuff at the moment).
• One last technical note: This beta version loads a lot of images (with a complete size of about 640 kB). I am working on the final version to be bugless (see above) and to be not bigger than 10 kB in total. But as I said above, it may take some time (doing Java Applets some time after midnight doesn't help having good ideas to get rid of bugs;-)...
• To download this applet and all including files, click onto DOWNLOAD.
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Comments

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