Thirdly, that cessation in the movent does not cause cessation in that which was moved by it. For (by number 11 of art. 1 of this chapter) whatsoever is moved perseveres in the same way and with the same swiftness, as long as it is not hindered by something that is moved against it. Now it is manifest, that cessation is not contrary motion; and therefore it follows that the standing still of the movent does not make it necessary that the thing moved should also stand still. Coroll. They are therefore deceived, that reckon the taking away of the impediment or resistance for one of the causes of motion. [Sidenote: Divers considerations of motions.] 4. Motion is brought into account for divers respects; first, as in a body _undivided_, that is, considered as a point; or, as in a _divided_ body. In an undivided body, when we suppose the way, by which the motion is made, to be a line; and in a divided body, when we compute the motion of the several parts of that body, as of parts. Secondly, from the diversity of the regulation of motion, it is in body, considered as undivided. sometimes _uniform_ and sometimes _multiform_. _Uniform_ is that by which equal lines are always transmitted in equal times; and _multiform_, when in one time more, in another time less space is transmitted. Again, of multiform motions, there are some in which the degrees of acceleration and retardation proceed in the same proportions, which the spaces transmitted have, whether duplicate, or triplicate, or by whatsoever number multiplied; and others in which it is otherwise. Thirdly, from the number of the movents; that is, one motion is made by one movent only, and another by the concourse of many movents. Fourthly, from the position of that line in which a body is moved, in respect of some other line; and from hence one motion is called _perpendicular_, another _oblique_, another _parallel_. Fifthly, from the position of the movent in respect of the moved body; from whence one motion is _pulsion_ or driving, another _traction_ or drawing. _Pulsion_, when the movent makes the moved body go before it; and _traction_, when it makes it follow. Again, there are two sorts of _pulsion_; one, when the motions of the movent and moved body begin both together, which may be called _trusion_ or _thrusting_ and _vection_; the other, when the movent is first moved, and afterwards the moved body, which motion is called _percussion_ or _stroke_. Sixthly, motion is considered sometimes from the effect only which the movent works in the moved body, which is usually called _moment_. Now _moment is the excess of motion which the movent has above the motion or endeavour of the resisting body_.