1 added text into the source codes

2 verified the physics of // Torque = I.alpha // mgRsin cta = mR*R alpha in the codes

3 added weight mg and tension T to represent forces acting on mass m during free body diagram analysis

4 formula string for Fr, Ft and COE during circular motion for fostering deep understanding from a symbolic representation stand point to the macro world view

5 added angular displacement theta, angular velocity omega, time t, centripetal acceleration a-r, tangential acceleration at

6 added tangential velocity v and radial velocity vr

7 change some color scheme

8 add some slider and bars to show values

9 design all variables to be drawn in 2D with checkboxes for sense making

10 decode the newton 2nd law in circular motion with mgRsin cta = mR*R alpha

11 too tired to write compare http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=190.0 with this post to know changes made by me Smiley

12 added plot to show s vs t, v vs t and a vs t in x and y and resultant component from an eariler applet i made http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=745.0

13 added x00 y00 for visualization of position 1 in the formula of WD[sub]+[/sub] +KE1+PE1 = KE2+PE2+WD[sub]-[/sub]

14 added many standard variables in circular motion

15 made world view draggable mass m ! http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1895msg6855;topicseen#msg6855

17May2011

added g slider and text for horizontal/vertical view and motion suggestion by leongster

[s]thing to do but can't

a dragg-able mass m , currently to codes seems to be jammed by

x=R*Math.sin(cta);

y=R*Math.cos(cta);

[/s]