GREEN and BLUE are on a circular track.[br][br]Use the sliders to set their speeds.[br][br]You can trace the motion of a point on the line joining the two points.[br]Alternatively, you can trace the separation of the two points as they[br]move around the track.[br][br]How does the separation between GREEN and BLUE vary with time, [br]when[br] a) they are both traveling in one direction at different speeds[br] b) they are traveling in opposite directions but at the same speed[br] c) they are traveling in opposite directions at different speeds[br][br]How does the position of a point on the line segment separating GREEN and BLUE vary with time, [br]when[br] a) GREEN & BLUE are traveling in one direction at different speeds[br] b) GREEN & BLUE are traveling in opposite directions but at the same speed[br] c) GREEN & BLUE are traveling in opposite directions at different speeds[br][br]How do all these quantites change as you move the point YELLOW point [br]along the line segment separating GREEN & BLUE?[br][br]Use the buttons to start & stop an animation.[br][br][color=#ff0000][i][b]What questions could/would you pose to your students based on this applet?[/b][/i][/color][br][br][color=#ff0000][i][b]What sorts of answers do you imagine getting when you ask those questions?[/b][/i][/color]