Law I: Every body persists in its state of ...moving uniformly straight forward, except insofar as it is compelled to change its state by force impressed.
Law II: The alteration of motion is ever proportional to the motive force impressed...
LAW III: To every action there is always opposed an equal reaction: or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts. — Whatever draws or presses another is as much drawn or pressed by that other. If you press a stone with your finger, the finger is also pressed by the stone… If a body impinges upon another, and by its force changes the motion of the other, that body also (because of the equality of the mutual pressure) will undergo an equal change, in its own motion, toward the contrary part… This law takes place also in attractions…
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