Newton's first law, as you all know it, states:
Every body perseveres in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed thereon.
Now what is force? To me force means action by which the velocity of an object changes. Now following this definition of force First Law doesn't seem any law.
It is just like saying that; If in a world where there are no mangoes, in that world there can't be any mango juice. When I/we say that "If their were no force" , it means that "If there were no things/action to change our motion". So clearly in such world where there is no force/friction then there can't be any thing which can "change our motion". So that implies that object will continue to be in uniform motion . You can see that first law is not a law, but is mere an implication from a trivial definition of force. So why then first law is a law?