[ithinkso]

Your 'duh's escalated quite quickly, I had a Euclid postulates feelings when reading it - first four are 'duh' and then the fifth one comes swinging.

(by the way I think you have your Newton's law order wrong, that's the second one you're referering to)

[jameshart]

First law (inertia) basically states that in the absence of a force, no acceleration can happen (sometimes stated as ‘an object in motion will remain in motion, an object at rest will remain at rest’).

Second law gets more specific, and clarifies that the size of the acceleration is proportional to the size of the force.