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Newton's laws of motion, in the rather obscure language of the Principia, take the following form:
Newton's laws of motion
Let us now examine how these laws can be applied to a system of point objects.
- Every body continues in its state of rest, or uniform motion in a
straight line, unless
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 on each other are always equal, and directed to contrary parts.