Recently I was out shooting some pics during #snowmageddon as many people were calling it here in Tennessee. While out, I was at the Harpeth river and decided to shoot the water running through the rocky stream bed.
I decided to shoot three shots using different shutter speeds so you could see the effect of shutter on the visual quality of MOTION.
If you ever get confused about visual characteristics, remember TIME controls MOTION BLUR. The first image was shot at 1.3 seconds, the second image was shot at 1/40th sec. and the third image at 1/1600th sec.
Without going into the other two settings (Aperture and ISO) notice that as the TIME gets shorter (a faster shutter speed), the image gets sharper until there is essentially no more blur in the image caused by movement.
Notice also at the same time that the non-moving parts of the image (the rocks) are sharp in each shot. That's because since they're not moving there is nothing to blur across the frame. In other words, TIME has no effect on their appearance because they're not moving!
Here's another shot done with a longer shutter to create motion blur.
While you're at it, just google "long shutter photography" click on Images, and see what beauty can be created by playing with this wonderful control!
So next time you're out and you want to control motion blur, get those fingers on that shutter speed and see what happens. Be prepared to use a tripod or something to steady your long shutter shots and as always, have fun!