Curves

The curve of the sails and the slight bow wave indicate movement. The yacht is also positioned on the edge of the image that supports the feeling of movement as does the space in front of the yacht.

 

The Opera House roof in Sydney Australia was designed to represent sails and the curving of the individual elements strongly suggest movement.

In this image the curvature of the animal's back is indicative of preparation to move.  

(What cannot be seen is the keeper about to offer food to this and a number of other monkeys and subsequent behaviour was indicative of a high degree of competition with the prize going to the fastest mover)

Indication of movement is provided by the water in the channel at the side of the steps. It is also indicated by the powerful curve  and a sense of a steep descent down the steps.

General comment

Curves were not difficult to find and it was a matter of choice as to which ones to use. As I was not totally convinced that curves always imply movement I used the more obvious examples from my photographs.

Direction is not always obvious and requires interpretation on the part of the viewer.

In the first image it is self evident because we do not expect a yacht with wind in its sails to go backwards. Equally the image of the Opera House suggests that the building is 'moving' to the right. In reality it is landlocked on that side but presumably the architect wanted to give the impression of arriving in Australia rather than leaving.

With the monkey its most likely movement is in the direction of its gaze. However it could be keeping a very wary eye on something that is a threat meaning that its next move would be in the opposite direction. 

The final image is most likely be seen as going from top to bottom because of the presence of the water which does not normally flow up hill. However, to me, the steps seem to be rising so that the image can be 'read' from bottom to top.