Something critical that I gained from listening to Vincent LaForet was relating to making photos rather than taking. This series of images was intended to do just that. I adjust the shutter speed manually from 1/500 of a second to 1/15 of a second. At 1/500, the water appears to stop and is in close focus. At 1/15 of a second the rock can be in perfect focus while the water becomes a white blur.
I am sure that there is a way as a science lesson to use the photo to see how fast the water was flowing at the time.
