The principles of mechanics: designed for the use of students in the University / [James Wood].

  • James Wood
Date:
1796
Catalogue details

Licence: Public Domain Mark

Credit: The principles of mechanics: designed for the use of students in the University / [James Wood]. Source: Wellcome Collection.

    17/358 page 11
    the fame place, is different at different distances from the center of the earth; whereas, the inertia is always, and under all circumftances, the fame. 10. By motion we under ft and a change of place; and it is of two kinds, abfolute and relative. A body is faid to be in abfolute motion when it is actually transferred from one point in fixed fpace to another; and to be relatively in motion, when it’s fituation is changed with refpetft to the furrounding bodies. Thefe two kinds of motion evidently coincide when the bodies, to which the reference is made, happen to be fixed. In other cafes, a body relatively in mo- tion, or relatively at reft, may or may not be abfolutely in motion. Thus, a fpe&ator ftanding ftill on the fhore, if his place be referred to a fhip which fails by, is relatively in motion; and the feveral parts of the veffel are at reft, with refpecft to each other, though the whole is transferred from one part of fpace to another. When a body always paffes over equal parts of fpace in equal fjcceffive portions of time, it’s motion is laid to be uniform. When the fucceffive portions of fpace, defcribed in equal times, continually increafe, the motion is faid to be accelerated; and to be retarded., when thofe fpaces continually decreafe. Alfo, the motion is faid to be uniformly accelerated or retarded, when the increments or decrements of the lpaces, defcribed in equal fucceffive portions of time, are always equal. 11. The velocity of a body, or rate of it’s motion, is meafured by the fpace, uniformly defcribed in a given time. The /
    digitised image 1
    digitised image 2
    digitised image 3