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Newton's laws of motion, in the rather obscure language of the Principia, take the following form:
Let us now examine how these laws can be applied to dynamical systems.
- Every body continues in its state of rest, or uniform motion in a
compelled to change that state by forces impressed upon it.
- The change of motion (i.e., momentum) of an object is proportional to the force impressed upon
it, and is made in the direction of the straight-line in which the force is impressed.
- 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.