What is Newton’s First Law of Motion?

Newton’s First Law of Motion Newton's first law of motion states that - A body remains in the state of rest or uniform motion in a straight line unless and until an external force acts on it. Newton's I law gives the qualitative definition of force, according to which "force is that external cause which tends to change or actually change the state of motion of the body". Putting Newton's $1^{\text {st }}$ law of motion in simple words, a body will not start moving until and unless an external fo...