Here's why:

* Newton's First Law of Motion states that an object at rest will stay at rest, and an object in motion will stay in motion at a constant velocity, unless acted upon by a net force.

* Net Force: This is the overall force acting on an object after considering all the individual forces. If the net force is zero, the object will not accelerate.

* Balanced Forces: When forces are balanced, they cancel each other out, resulting in a net force of zero.

Example: Imagine a book sitting on a table.

* Gravity is pulling the book down.

* The table's normal force is pushing the book upwards.

* These forces are equal and opposite, creating a balanced force, so the book remains at rest.