CONCEPT OF MOTION IN PHILOSOPHY OF NATURE

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MOTION
Nature is the principle of motion and change.
The definition of motion , therefore, will involve the notions of potency and act (also of privation and possession) and the categories of substance, quantity,  quality  and location, which will be
used to determine the species of motion. It will also involve the relationship between the thing being moved and the mover.

Definition of motion(Book , Lesson 2)
Some have  defined  motion  by  saying  that  motion  is  “a  going-out  from  potency  to  act  which is  not sudden”. This was highly criticized in fr. Kenny’s note, because they have placed the definitional element that are posterior to motion: for “going-out” is a species of motion; “sudden”, likewise, involves time in it’s definition, since is what occurs in the indivisible of time.
Some things are in act only, some others in potency only and some in the midway between potency and act. For what is in potency is not moved and what is in perfect act is not being moved but has already being moved and what is in midway between pure potency and act, which is partly in potency and partly in act)as is evident in alteration.
This definition can be specified according to the different species of motion: thus alteration is the act of the alterable in so far as it is alterable; growth is the size of what is capable of growth in so far as it is capable of growth; locomotion is the localization of what can change place in so far as it is capable of changing place. Later we will see that generation and corruption are not, strictly speaking, motion.

Motion is in act: for something which has previously being existing in potency to come to actuality is act itself, and for it to move from potency to act there has to be a motion. So, motion is in act.
• Motion is the act of a thing existing in potency
• Motion is the act of something in potency in so far as it is in potency
• Motion is the act of something in potency in so far as it is in potency

5.3 Action and passion are the same motion(Book 3, lesson 4-5)   
we can say that motion is the act both of the mover and of the mobile.  To give a specific
example, we  can  say that building is the  act of  the  builder  and  of the  buildable  in so  far  as each  is capable of building or of being built.

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