Final answer:
An object at rest will stay at rest until an unbalanced force acts on it.
Step-by-step explanation:
An object at rest will stay at rest until an unbalanced force acts on it.
When there is no net force acting on an object, it remains at rest or continues to move at a constant velocity. This is known as Newton's first law of motion, or the law of inertia.
For example, if you push a book on a table with a force less than the force of friction, the book will stay at rest. It will only start moving if an unbalanced force, like a push with greater force than friction, is applied to it.
Learn more about Newton's first law of motion