what is meant by an unbalanced force? Illustrate your answer with an example

Question

The definition of unbalanced force and the example of this question

Answer 1

If a force on an object is unbalanced, that means there is no equal and opposite force acting on the object, resulting in a net force, and subsequently, causing a net acceleration in the direction of the net force.

 

Example:

 

Consider an object what weighs 10 pounds hanging from a vertical cable, and the cable has a tension of 7 pounds.  Then the object has an upward force of 7 pounds on it, and a downward force of 10 pounds.  The upward force does not balance the downward force, so there is a net downward force of 3 pounds on the object, and hence a net downward acceleration on it.