The Mathematical equation of Newton's 1st law is :
The Conservation of Energy or Equilibrium dE/dr = F= ma = mdv/dt = 0.
Thus acceleration is zero when there is no force and no acceleration means no change in velocity or velocity is constant at Equilibrium.
F=ma Input: newtons second law at wolframalpha.com
Its a matter of being scientifically rigorous. You can not claim the 2nd law as a law unless you first establish the first law.
netwons 3rd law
Newton's 2nd law is F=ma.
the law of inertia
yeah.
Law of inertia.
The Universal Law of Gravitation is a force equation, therefore it should have units of Newtons.
F = ma F stands for force and m the mass and a the acceleration.
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Law of Inertia.
It isn't.