The
graphing window displays a circle of radius a in green, its center in
purple, a radial line segment of length b in cyan, and a point (a "light")
at the end of that radial line segment in yellow.
Set
the wheel radius a and the radial setting b of the light using sliders
at the bottom.
Animate
the rolling wheel using the [>>] key, or control its position
by grabbing the θ slider, or by
dragging the cursor over the graphing window with the mouse button depressed.
The [<<] key resets θ to θ = 0.
The value of θ, the angle of rotation, ranges from 0 to 6π if
a < 1 and from 0 to the value of θ at which the center has x
coordinate 6π if a > 1.
Select
the toggle [trace] to cause the light to leave a yellow trace and of
the center of the wheel to leave a purple trace.
Select
the toggle [velocity vector] to display the velocity vector in red.
Roll
the cursor over the graphing window to create crosshairs and a readout
of the cursor position.
©
2001 H. Hohn