* Newton's First Law of Motion (Law of Inertia): 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.
* Constant Velocity: This means an object is moving at a steady speed in a straight line. It's not accelerating (changing speed or direction).
In simpler terms:
* Inertia is the tendency of an object to resist changes in its motion.
* If there are no forces acting on an object, it will continue doing what it's already doing - either staying still or moving at a constant velocity.
Examples:
* A ball rolling across a smooth, flat surface will continue rolling at a constant speed in a straight line until something (like friction) slows it down or changes its direction.
* A spaceship in deep space, far away from any gravitational forces, will continue moving at a constant velocity in a straight line even if its engines are turned off.
