According to Newton's first law, what will an object in motion do?

According to Newton's first law of motion, also known as the law of inertia, an object that is in motion will remain in motion with the same speed and in the same direction unless acted upon by an unbalanced external force. This principle highlights the concept of inertia, which is the tendency of objects to resist changes in their state of motion. Therefore, if no net force is acting on a moving object, it will continue to travel in a straight line at a constant velocity.

This understanding is crucial in various areas of physics, as it helps to explain why objects in space continue to move indefinitely until they encounter some form of resistance or influence. This foundational idea underpins many other dynamics and motion-related concepts in physics and engineering.