Here's why:

* Balanced forces mean that the forces acting on an object are equal in magnitude and opposite in direction. This results in a net force of zero.

* Acceleration is the rate of change of velocity. It requires a net force to occur.

Therefore, balanced forces do not cause an object to accelerate. They result in the object remaining at rest or moving at a constant velocity.

Think of it this way:

* If you push a box with the same force as your friend pulls it in the opposite direction, the box won't move. The forces are balanced, and there's no net force to cause acceleration.