How to show motion in a single shot has intrigued photographers since the invention of the camera. Anything that normally moves can be slowed enough by a camera to give the impression of movement. Water is probably the most common subject where a waterfall (for instance) is rendered as a smooth torrent over rocks.
Panning, moving the camera with a moving subject, can also imply movement if the proper shutter speed is used. The trick is to use a slow enough shutter speed to blur the background while, at the same time, using a fast enough shutter speed to keep the main subject fairly sharp.
Here again, my grandson was the willing foil for my practice with the technique. As with the technique described in the post, "Time Travel") you have to be able to control the shutter speed and a gray day will work better than a sunny one. The time on all three of these shots was 1/15 second at f/16. Depending on your results, you can make small adjustments to shutter or aperture and repeat until you achieve something you like.
I wasn't using a tripod on these shots, so there is two kinds of movement, the streaks from panning and the up and down movement from not holding the camera completely steady. One further tip: always keep you active focus on the same spot - for example, his eye - for better results.
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