A decorative woodcut headpiece featuring symmetrical scrolling foliate motifs and strapwork centered around a cartouche or shield-like element.

CHAPTER ONE

ON MOTION IN GENERAL.

DEFINITION 1.

Motion is the translation translation: the movement of an object from one location to another, as opposed to rotation or internal change of a body from the place it occupied into another. Rest, however, is the persistence of a body in the same place.

Corollary 1.

2. Therefore, the ideas of motion and rest cannot apply to things other than those which occupy a place. Since this is a property specific to bodies Euler uses the term "body" (Latin: corpus) to refer to any physical object or matter—to occupy a place—it can be said of a body alone that it moves or rests.

Corollary 2.

3. And this idea of motion and rest is so proper to a body that it pertains to absolutely all bodies. For no body can exist which is not either in motion or at rest.

DEFINITION 2.

4. Place is a portion of that immense or infinite space in which the entire universe exists. This is called in this sen-