Circulation Motion and Centripetal Force applet modified for F = m*v^2/r lookang
Ejs Open source Circular Motion and Centripetal Force java applet F = m*v^2/r

applet modified legally under from http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=693.msg2488#msg2488  
Circular motion: acceleration always perpendicular to velocity

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