Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.

Summary

This quote, often referred to as Newton's First Law of Motion or the law of inertia, explains that an object's natural tendency is to maintain its current state of motion, whether that is resting or moving in a straight line at a constant speed. However, any change in this state requires external forces to act upon the object. In other words, objects will stay at rest or continue moving in a straight line until a force is applied to alter their motion.

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