Holy cow, it worked! After showing this and asking “what do you notice?“, the kids were so eager to make it happen. My picture was snapped just after two waves met in the middle of a Slinky, added their amplitudes, and destroyed the target. Moments before, the waves had small enough amplitudes to pass through the gates nearest the wave-generating students.
We walked away from the lab table with a lot of feel for how the superposition principle works.
Also, Frank has a similar video which makes me want a high-speed camera something fierce.
Speaking of waves, we had a pep rally today. Of course I recorded the Wave. Can you tell me the type of wave pictured? Its velocity, period, amplitude, and frequency?