Newton's First 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.

Here's how to restate it in terms of acceleration:

* If the net force acting on an object is zero, then its acceleration is zero.

This means:

* If an object is at rest (zero velocity), and the net force on it is zero, it will remain at rest. (No acceleration)

* If an object is moving at a constant velocity (no change in speed or direction), and the net force on it is zero, it will continue moving at that constant velocity. (No acceleration)

In essence, Newton's First Law tells us that an object will only accelerate if there's a net force acting on it. If there's no net force, there's no acceleration.