Imagine the three circles in the left hand panel are three meshing gears.[br][br]You can move the entire gear train by dragging the large BLUE dot. [br][You can also animate the motion.][br][br]How are the radii of the three gears related?[br][br]How are the angular velocities of the three gears related?[br][br]How are the linear speeds of BLUE, YELLOW & GREEN dots related?[br][br]How would you introduce the practical uses of gear trains to your students?[br][br][color=#ff0000][i][b]What other questions could/would you ask of your students based on this applet?[/b][/i][/color]