en.wikipedia.org/wiki/Motion_blur

In such an image, any object moving with respect to the camera will look blurred or smeared along the direction of relative motion.

truecenterpublishing.com/photopsy/movement.htm

The sense of movement can be created in a photograph by repetition, blur, ... in that direction will feel more natural than the opposite path from right to left, which  ...

digital-photography-school.com/a-beginners-to-capturing-motion-in-your-photography

The direction you take depends upon your objective for your photograph. A lot of photographers capture motion simply to convey that an object is moving.

digital-photography-school.com/how-to-capture-motion-blur-in-photography

Capturing movement in images is something that many photographers only think .... of movement from the legs as one leg moves in the opposite direction to the ...

www.outdoorphotographer.com/tips-techniques/photo-tip-of-week/leave-space-for-movement

Nov 1, 2010 ... Leaving room for implied movement of your subject is important in ... on the opposite side from the direction of movement or direction of stare.

www.amateurphotographer.co.uk/technique/camera_skills/introducing-blur-movement-images-91240

Aug 11, 2016 ... When working with camera movement, subject choice is critical – you can't ... of photography is pushing photographers in the same direction.

www.lightstalking.com/movement-photography

Jun 10, 2016 ... Playing with Shutter Speeds and tripods is always a load of fun and can be a really creative way of capturing movement in many different ways.

www.digitalphotopro.com/profiles/the-art-of-movement

Jul 30, 2018 ... The movement was accidental, but I liked it, so I developed it into a ... The camera moves during the exposure in a direction that moves the ...

www.howtogeek.com/353823/freeze-or-blur-the-two-ways-to-capture-movement-in-photography

Jun 6, 2018 ... It's not a bad photo, but you can't feel the movement. ... completely opposite direction, and use a slow shutter speed that lets all movement blur.