Though a photograph is a snapshot in time, the world around us is in constant motion. This call is not about "still life", "landscape", or "posed portrait" images. It is about how you capture the idea of motion/momentum in a single frame; photographs that clearly send a message to the viewer that the subject or the camera/lens is moving. Is the position of the subject the indication - a wave arched to crash, or a ballerina in mid air? Or is it the subject or background blurred as in a speeding train you have panned with background buildings a blur?
Examples are everywhere - the silky vision of water over a waterfall taken at a slow shutter speed, water droplets frozen in time, trees bent in blowing wind, ripples of a boat's wake, fireworks. Sports, transportation and animals each afford a huge number of possibilities and, of course, there are endless ways camera and zoom action can draw the viewers eye.