This law is evident when your riding in a car without a seat belt and the car stops suddenly you continue to move forward

Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion.

It's because 3 if it was 10 it wouldn't look right do it goes up to 4d