Explanation:

* Balanced forces are equal in magnitude and opposite in direction. This means that the net force acting on the object is zero.

* Newton's First Law of Motion states that an object at rest will remain at rest, and an object in motion will continue in motion at a constant speed and in a straight line unless acted upon by an unbalanced force.

* When forces are balanced, there is no net force to change the object's motion. Therefore, the object will continue moving at a constant speed and in a straight line.

Example:

A car traveling at a constant speed on a straight road has balanced forces acting on it. The engine's force is balanced by the force of friction from the road and air resistance.

Unbalanced forces cause a change in an object's speed or direction. For example, if a force is applied to a moving object, the object will accelerate or decelerate, or change direction.