Superposition of pulses
Suppose that there is a pulse moves to the right.
There is a upward transverse motion along the leading edge
of the pulse.
The transverse motion vanishes at the peak,
and there is downward transverse
motion along the trailing edge .
Let us consider the superposition of two pulses of identical shape moving
relative to each other.
1. Click right mouse to toggle the animation.
When the animation stops. The blue curves show the current pulses.
2. Click right mouse button twice quickly will reset all the parameters.
while those red curves show the pulse at the next time
Those red arrows indicate the relative motion of pulses.
Blue arrows are moving directions of those pulses.
For transverse wave blue arrow and red arrow are perpendicular to each
Even though the wave is flat for a brief
moment, It is not at rest.