１５ Newtonian Mechanics 【What is
the Universe？】Dialogue
with the Universe
・Three laws
of Newtonian mechanics
1) Law
of inertia・・・As for an object,
unless power acts -- stillness -- linear uniform motion is carried out.
2) Equation
of motion・・・At a mass point the
acceleration(a) is proportional to the power(F) of acting then, and is in inverse
proportion to the mass(m).
Ｆ＝ｍａ
3) Action-reaction
law
・Law of
universal gravitation
○Newtonian
mechanics can be used when treating movement of sufficiently later than the
velocity of light in a macroscopic scale(0.1 mm or more). For example, in the space navigation in an
artificial satellite or planetary exploration, it is calculable in sufficient
accuracy using Newtonian mechanics in many cases.
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