Motion and blow. / The more the thing that moves with violence is in the middle of its straight course, the more speed its motion has and the more it will damage its object. / Motion. / Curved motion is the weakest that the moving powers can make. / Motion. / The reflex motion, or bounce, will be of continual revolution of the moved body. / Blow. / The object struck near the birth of the reflex motion will be more damaged by it than if it had been struck by the first percussion, because it goes turning and rasps and strikes, whereas the first only intends to enter the place struck by it, because it never turns. / Motion. / The more the reflex motion is created by the first at its greatest power at more acute angles, with greater revolution of the moved body and greater injury to the struck object, will its course proceed, than if it had been followed in any other way. / Blow. / If the thing struck is of equal quality to that which strikes, their damages will be equal. / Blow. / That object which is struck at more equal angles will be more damaged. That thing is more damaged which is struck at more equal angles.