Have remixed this version to be use for primary school. Thank to W. Christian and F. Esquembre for their original code.

Design features:
(1) Students adjust the length of the string
(2) Energy Bars and Energy Line Graph
(3) Consistent Colour Scheme (For KE and GPE)
(4) Indicate the height .

Teacher can use this applet and get the students to decide what they must do to ensure the bob will have the greatest KE.
Possible guiding question:
(1) At which position do you think the KE/GPE is the max?
(2) What can you change to make sure KE is the max?

translate strings in simulation to different language format before download
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
Download EJS jar file(1565.6kB):double click downloaded file to run it. (6 times by 5 users) , Download EJS source View EJS source