Science with Julius Sumner Miller 09 Newtons First Law

Newton's First Law of Motion, also known as the Law of Inertia, states: "An object at rest will stay at rest, and an object in motion will stay in motion, unless acted upon by an outside force." In simpler terms, this law means that things don’t change their state (whether they’re still or moving) unless something pushes or pulls on them. For example: If you slide a book on a table, it eventually slows down and stops because of friction, which is an external force. If you're in a car that suddenly brakes, your body wants to keep moving forward because of inertia, but the seatbelt (acting as an external force) stops you. So, basically, without an external force (like friction or gravity), things would keep doing what they’re doing—staying still or moving in a straight line forever!