* Newton's First Law of Motion (Law of Inertia): This law states that 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.
* Zero Net Force: When the forces acting on an object are balanced (sum is zero), there is no net force. This means there's no force to change the object's state of motion.
In simpler terms:
Imagine a car cruising down a straight road at a constant speed. If the engine's forward force is perfectly balanced by air resistance and friction, the car will continue at the same speed without speeding up or slowing down.
Key points:
* The object will maintain its speed (how fast it's going).
* The object will maintain its direction (the path it's traveling on).
Examples:
* A satellite orbiting Earth experiences zero net force (gravity pulling it in is balanced by its orbital velocity), allowing it to maintain its orbit.
* A hockey puck sliding across frictionless ice will continue moving at a constant velocity until it encounters a force (like a stick hitting it).
