Newton's first law of motion states that an object at rest will remain at rest, and an object in motion will remain in motion (and travel at a constant velocity along a straight line)as long as no force is exerted on the object.

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Newton's first law of motion, also known as the law of inertia, states exactly that: an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Newton's First Law of Motion States That an Object at Rest