The law that talks about objects at rest and in motion is Newton's First Law of Motion, also known as the Law of Inertia.

Here's what it states:

* 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.

In simpler terms:

* Objects don't move on their own. They need a push or a pull (a force) to get them moving.

* Once an object is moving, it will keep moving in a straight line at a constant speed unless something stops it or changes its direction.

Examples:

* A ball sitting on a table will stay there until someone kicks it.

* A car moving at a constant speed will continue moving at that speed unless someone steps on the brakes or the car hits something.

Let me know if you have any other questions!