Here's the breakdown:

* Force: A push or pull that can change an object's motion.

* Balanced forces: When multiple forces act on an object, but their effects cancel each other out. This means the net force (the overall effect of all forces) is zero.

Why Balanced Forces Don't Change Motion

* Newton's First Law of Motion: An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

* No Net Change: Since balanced forces have no net effect, they don't cause any acceleration (change in speed or direction).

Examples:

* A book sitting on a table: The force of gravity pulling the book down is balanced by the normal force from the table pushing the book up. The book remains still.

* A car moving at a constant speed: The force of the engine pushing the car forward is balanced by the forces of friction and air resistance. The car maintains a steady speed.

Let me know if you'd like more examples or have any other questions!