Newton's First Law

Newton's First Law
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Isaac Newton's (a 17th century scientist) first law of motion - sometimes referred to as the "Law of inertia".

stated as
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An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

In other words all the objects "Keep on doing what they are doing" unless forced otherwise. If the object is at rest it will be at rest. If the object is in motion at x speed then it will be in motion forever in x speed.

Everyday Applications of Newton's First Law
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Have you ever experienced inertia (resisting changes in your state of motion) in an automobile while it is braking to a stop? The force of the road on the locked wheels provides the unbalanced force to change the car's state of motion, yet there is no unbalanced force to change your own state of motion. Thus, you continue in motion, sliding along the seat in forward motion. A person in motion stays in motion with the same speed and in the same direction, unless acted upon by the unbalanced force of a seat belt. Yes! Seat belts are used to provide safety for passengers whose motion is governed by Newton's laws. The seat belt provides the unbalanced force that brings you from a state of motion to a state of rest.

Simple - Simply Classified

Any theorem taking more than four lines to be explained, is termed as COMPLEX.
Any theorem that cannot be understood by class 7 student is termed as COMPLEX.
Any theorem (invention) do not have practical usage is USELESS.