* Newton's First Law of Motion (Law of Inertia): This law states that an object at rest will stay at rest, and an object in motion will stay in motion at a constant speed and direction *unless acted upon by an unbalanced force*.
* Balanced Forces: Balanced forces are forces that are equal in magnitude and opposite in direction. This means they cancel each other out.
Examples:
* A book on a table: The force of gravity pulling the book down is balanced by the normal force from the table pushing the book up. The book remains at rest.
* A car moving at a constant speed: The force of the engine pushing the car forward is balanced by the forces of friction from the road and air resistance. The car continues moving at a constant speed.
Important Note: Even if an object is moving at a constant velocity, it is still subject to forces. The forces are simply balanced, resulting in no net force and no acceleration.
