The Principia
And first law of motion
The principia consisted of a diagnostic look at how
bodies in motion act. It consisted of 3
main parts; the first part explaining the laws of motion, the second describing
his theory on fluids, and the third showing the law of gravity at work in the
universe. The 3 laws of motion and the
law of gravity are what Newton is most well known for. The first law of motion states that an object
in motion will stay in motion unless an external force is acted upon the
object. This can be applied to someone
on ice skates on a very large lake that is frozen over smoothly. Pretend that this person is moving along on
the lake and stops to glide after attaining a speed. This speed will remain the same, excluding
any friction which is an external force, unless the person runs out of lake or
is stopped.
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