changes the motion of the object
When a nonzero net force acts on an object, the object will accelerate in the direction of the force. The acceleration of the object is directly proportional to the net force applied and inversely proportional to the mass of the object, as described by Newton's second law of motion (F = ma).
When a pair of balanced forces acts on an object, the net force that results is equal to zero.
The answer to your question is Work. The definition of work is: "When a force acts against resistance to produce motion in a body, the force is said to do work." - The CRC Handbook of Chemistry and Physics... Which means the exertion of a force on an object that produces motion in the direction of the force.
Perpendicular Force is the forces that acts at right angle to the object.
If a nonzero net force acts in the same direction as the object's velocity, the object's velocity will increase over time. This is because the force accelerates the object in the same direction as its motion, causing it to speed up.
If the net force is zero, then the forces are balanced. If the net force is not zero, then the forces are not balanced. You can have a balanced pair of forces, but not a pair of balanced forces.
Forces such as gravity, friction, tension, and applied forces can cause acceleration in an object. When an unbalanced force acts on an object, it can cause the object to accelerate in the direction of the force.
When the entire group of forces acting on an object is unbalanced,the object will accelerate.There's no such thing as "an unbalanced force".
A force that acts on an object, but does not cause any movement (specifically, a change in velocity) of the object, is (by Newton's law) equally and opposite balanced by other forces.
When a force acts on an object without touching it, the force is called a non-contact force. Examples include gravitational, electrostatic, and magnetic forces.
When a pair of balanced forces act on an object, the net force is zero. This means that the forces cancel each other out, resulting in no acceleration of the object.
When more than one force acts on an object, it is called a net force. The net force is the combination of all the individual forces acting on an object. It determines the object's resulting motion and acceleration.