**Newton's laws of motion - Wikipedia**
https://en.wikipedia.org/wiki/Newton%27s_laws_of_motion

Newton's first law. Newton's first law is also called the "law of inertia", and it states that an object at rest remains at rest, and an object that is moving will continue to move straight and with constant velocity, if and only if the net force acting on that object is zero.: 140 If an object is experiencing any number of different external applied forces ,, …,, then the net force is the ...

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