Theory of Existence: Pt. I. Devoted to the Enunciation of the Laws which Determine the Motions that Result from the Collision of Ponderable Bodies, Part 1

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E. Dexter, 1869 - Force and energy - 155 pages
 

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Page 123 - Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.
Page 127 - The change of motion is proportional to the motive force impressed ; and is made in the direction of the right line in which that force is impressed.
Page 127 - If any force generates a motion, a double force will generate double the motion, a triple force triple the motion, whether that force be impressed altogether and at once or gradually and successively.
Page 123 - The vis insita, or innate force of matter, is a power of resisting, by which every body, as much as in it lies, continues in its present state, whether it be of rest, or of moving uniformly forwards in a right line.
Page 133 - ... to every action there is always opposed an equal reaction: or, the mutual actions of two bodies upon each other are always equal, and direct to contrary parts.
Page 124 - ... so far as the body, by not easily giving way to the impressed force of another, endeavors to change the state of that other. Resistance is usually ascribed to bodies at rest, and impulse to those in motion; but motion and rest, as commonly conceived, are only relatively distinguished; nor are those bodies always truly at rest which commonly are taken to be so.
Page 123 - But a body only exerts this force when another force, impressed upon it, endeavors to change its condition; and the exercise of this force may be considered...
Page 136 - ... forces describes the diagonal of a parallelogram, in the same time that it would the sides with separate.
Page 123 - This force is always proportional to the body whose force it is and differs nothing from the inactivity of the mass, but in our manner of conceiving it. A body, from the inert nature of matter, is not without difficulty put out of its state of rest or motion. Upon which account, this vis insita may, by a most significant name, be called inertia (vis inertiae) or force of inactivity.
Page 124 - Every body perseveres in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed thereon.

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