Here's why:
* Newton's First Law of Motion (Law of Inertia): 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.
* Balanced Forces: When forces acting on an object are equal in magnitude and opposite in direction, they cancel each other out. This results in a net force of zero, meaning the object will remain at rest or continue moving at a constant velocity.
Example: Imagine a book sitting on a table. Gravity is pulling the book downwards, but the table is pushing back with an equal and opposite force. These forces are balanced, so the book remains stationary.