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Sir Isaac Newton
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- First Law:
A body in motion tends to stay in
motion, and a body at rest tends to stay at
rest.
- Second Law:
Force equals mass times
acceleration.
- Third Law:
For every action, there is an equal
and opposite reaction.
These laws were the basis of all dynamical
descriptions of the physical world from the 1700's until
the early 1900's. They describe the motion of objects in
the macroscopic world at normal speeds. Newtonian mechanics fails at the
subatomic level and when speeds become comparable to the speed of light. In those cases we require other sets of physical
laws such as quantum mechanics or relativity for a
complete description .
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