* Newton's First Law: 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 = Constant Velocity: When the net force on an object is zero, it means the forces acting on it are balanced. This doesn't mean the object is stationary, just that its velocity is constant. It could be moving at a constant speed in a straight line (uniform motion).
Examples:
* A car cruising at a constant speed on a highway: The forces of the engine pushing forward are balanced by the forces of friction and air resistance. The net force is zero, and the car maintains a constant velocity.
* A ball thrown in space (no air resistance): Once the ball is thrown, there's no force acting on it. The net force is zero, and the ball continues moving at a constant velocity in a straight line until it collides with something.
Key Takeaway: Zero net force means the object's velocity won't change, not that it will be zero.
