Here's why:
* Newton's First Law of Motion (Law of Inertia): This law 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: A net force is the overall force acting on an object, taking into account all the individual forces and their directions. If the forces balance out, the net force is zero, and the object's motion won't change.
Example:
Imagine a book sitting on a table. The book is at rest. There are two forces acting on it:
* Gravity: Pulling the book downwards.
* Normal Force: The table pushing the book upwards.
These forces are equal and opposite, so the net force is zero. The book remains at rest.
