This applet [b][b]Relative Motion on an Elevator Model[/b][/b] [b]written by Francisco Esquembre [/b]
Original applet  [u]http://www.compadre.org/osp/items/detail.cfm?ID=9974[/u]
The Relative Motion on an Elevator model displays the relative motion as seen by two classical observers.
The eight-years old kid Pepe Neurons plays yo-yo in an elevator with transparent walls in a shopping mall and his sister, Lola, looks at him from the ground floor of the shopping mall while he does so.  
Watch the motion of the kids, the elevator and the yo-yo from either Lola's or Pepe's perspective.

Now is available too portages(Brazil) version Translation by Ahmedelshfie, i attached the jar file.
Enjoy!

/htdocs/ntnujava/ejsuser/37048/users/br/Ahmedelshfie/RelativeMotionOnElevator_pkg/RelativeMotionOnElevator.propertiesFull 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
Download EJS jar file(1010.2kB):double click downloaded file to run it. (25 times by 16 users) , Download EJS source View EJS source