I think that it's like this:
" . . ."(Newton's first law)
the . . . stands for the actual law, and the parantheses and the words inside them are needed after you state the law to state whose law it is, and which one
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Newton's first law states that an object at rest will stay at rest, and an object in motion will stay in motion at a constant velocity unless acted upon by an external force. This means that an object will continue its current state of motion unless another force acts upon it to change that motion. It is often referred to as the law of inertia.
Newton's third law states that for every action there is an equal and opposite reaction.
Here action means force given by a body and reaction means force given by another body.
It is usually formulated along the lines of:
'Every action has an equal but opposing reaction'.
Its a matter of being scientifically rigorous. You can not claim the 2nd law as a law unless you first establish the first law.
It isn't.
No, his three laws do not directly address work done.
Actually, the first one is completely independent on the second one. But the second one doesn't make any sense without the first one.
It is sometimes referred to as the law of inertia.