Please check out [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=148.0]Simple Harmonic Motion and Uniform Circular Motion [/url] or [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=348.0]relations between simple harmonic motion and circular motion[/url] and several other simulations in this forum.