If no other forces act on an object at rest, it will remain at rest. This is a fundamental principle of physics called Newton's First Law of Motion, also known as the Law of Inertia.

Here's why:

* Inertia: Objects have a natural tendency to resist changes in their motion. This resistance is called inertia.

* Forces: Forces are pushes or pulls that can cause objects to accelerate (change their velocity).

* No Net Force: If there are no forces acting on the object, or if the forces are balanced (canceling each other out), there is no net force.

* Constant Velocity: An object with no net force acting on it will maintain its current state of motion. If it was at rest, it will stay at rest.

In simpler terms: An object at rest will stay at rest unless something pushes or pulls it.