It is impossible to make a point on a wheel or other thing that moves rapidly. This is against certain people who say that one cannot make 2 points on a turning wheel in so slow a time that these points are not close together. This cannot happen in experience, because reason does not permit it. For if you wish to make a point on a thing, it must be without any motion, because that point is made with divisible time. And if the thing receives the point, it will be with motion, and it will receive upon itself not a point but a line, which will be longer than the said point by as much as the time of the motion is briefer in the moving of the wheel than that in which the point is made.

Every heavy body desires that its center make itself the center of the whole universe.

And the more it approaches that site, the more swift and heavy it would become.

But impetus without opposition would prolong the end of the desire that the moved thing has.

And that gravity will show itself to be of greater weight whose descent is the less oblique.

And the heaviest part of bodies will make itself the guide of their motion.

And every body weighs along the line of its motion.

And whatever is lacking from the weight that moves is added to the thing that makes it descend along an oblique line.