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