... and forces. Here, I would like to use dynamic exclusively for forces and, for this reason, I will use cinematic or kinetic when I speak of movement. Using forces and movements, I will now try to classify the spatial actions and situations that we meet in our spatial experience. At the first step of my classification, I would like to oppose dynamic to not-dynamic. But one might object that force is always part of movement and that, therefore, dynamic always means kinetic while not-dynamic means static. For this reason, dynamic is often used as the opposite of static. Yet the contrast dynamic/static cannot replace the contrast dynamic/not dynamic for two reasons:. (1) To show that kinetic is not always equivalent to dynamic, physicists might give a leaden ball in rectilinear uniform movement as a counter-example. Indeed, if one disregards friction, no external force is necessary to keep the movement alive. But ...

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