Unbalanced forces change the motion of an object, meaning if the object is at rest, and unbalanced force causes the object to ___ ___
"start moving"
If the object is at rest and an unbalanced force acts on it, the object will start moving. Specifically, the object will start accelerating in the direction of the net force.
To better understand this concept, it is helpful to know Newton's first law of motion, which states that an object at rest tends to stay at rest, and an object in motion tends to stay in motion with the same speed and in the same direction, unless acted upon by an external force.
Therefore, when an unbalanced force acts on an object at rest, it overcomes the inertia of the object, causing it to accelerate in the direction of the net force. This acceleration results in a change in the object's motion, making it move from its initial resting position.